scholarly journals Utilization of Kalpataru Flower Extract (Hura crepitans Linn) as an Alternative Acid Base Indicator

2020 ◽  
Vol 9 (3) ◽  
pp. 148-157
Author(s):  
Bayu Riswanto ◽  
Sitti Aminah
Keyword(s):  
Strong Acid ◽  
Weak Acids ◽  
Acid Base ◽  
Flower Extract ◽  
Weak Bases ◽  
Base Solution ◽  
Acid Base Titration ◽  
Hura Crepitans ◽  
Dark Green ◽  
Strong Acids

Kalpataru flower (Hura crepitans Linn) is an anthocyanin-containing plant. This study aims to utilize extract from the kalpataru flower as an alternative acid base indicator and determine the type of acid-base titration suitable for extracting the kalpataru flower indicator. Kalpataru flowers are macerated with methanol solvent for around 2 hours. Kalpataru flower extract was tested as an indicator in acid-base solution, buffer, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acids with strong bases, weak acids with strong bases, and weak bases with strong acids. The results obtained in this study were: indicator extract of brownish yellow kalpataru flowers, in strong red acids, in strong bases of dark green, in weak pink acids, and in weak bases in light green. In the buffer, the indicator extract of the kalpataru flower has a range of pH pH 4-5 (pink-colorless) and pH 9-11 (yellowish green-dark green). The indicator of kalpataru flower extract can be used on strong acid titration with strong bases, weak acids with strong bases and weak bases with strong acids. Kalpataru flower extract can be used as an acid-base indicator.

Equivalence Points and Inflexion Points in Acid-Base Titration Curves

1963 ◽  
Vol 16 (5) ◽  
pp. 759 ◽  
Author(s):  
RH Stokes
Keyword(s):  
Strong Acid ◽  
Ionization Constants ◽  
Weak Acids ◽  
Acid Base ◽  
Strong Base ◽  
Titration Curves ◽  
Acid Base Titration

General equations are derived for the relation between pH and stoichiometric degree of neutralization in the titration of monoprotic and diprotic weak acids (or bases) with strong acid or strong base. From these equations the number and position of inflexion points in the curves is derived, and their relation to the equivalence points is shown. Methods for determining ionization constants from inflexion points are discussed.

scholarly journals Indikator Asam-Basa dari Bunga Dadap Merah (Erythrina crista-galliL.)

2017 ◽  
Vol 5 (1) ◽  
pp. 29
Author(s):  
Rahmawati Rahmawati ◽  
Siti Nuryanti ◽  
Ratman Ratman
Keyword(s):  
Colour Change ◽  
Strong Acid ◽  
Weak Acid ◽  
Weak Base ◽  
Acid Base ◽  
Buffer Solution ◽  
Strong Base ◽  
Flower Extract ◽  
Red Color ◽  
Dark Green

Dadap red (erythrina crista-galli L.) is belonged to the legumes (fabaceaea) family which, is one of the flowering shade plants that often used as an ornamental plant. This plant has a bright red flower, a taproot with root nodule bacteria nitrogen fixation and compound leaf consists three strands on each stem. This research is climed to proves that the extract of dadap red flower can be used as acid-base indicators. Dadap red flowers was macerated using methanol then filtered. The filtrate was ready to use as an acid-base indicator. The extract is tested in an acid-base, buffer solutions, and was compared with phenolphthalein for a strong acid with a strong base while a methyl orange a weak base with a strong acid. Based on the result, indicator of dadap red flower extrat in the strong acid was red colour, while in the weak acid was pink, and also in the strong base was dark green and in the weak base was purple. Furthermore, in the buffer solution, the indicator of dadap red flower extract gave four groups of colour change, namely red color at pH 1 to pH 6, colorless at pH 7 to pH 9, brown at pH 10 and blue at pH 11 to pH 12. Additionally, to attain the end point of titration, the indicators of dadap red flower extract gives a similar results with the comparison indicators. The results showed that the indicator of dadap red flower extracts can be used as an alternative indicator.

Juglone and Lawsone as Acid-Base Indicators

1977 ◽  
Vol 32 (8) ◽  
pp. 890-892 ◽  
Author(s):  
Krishna C. Joshi ◽  
P. Singh ◽  
G. Singh
Keyword(s):  
Weak Acids ◽  
Acid Base ◽  
Natural Sources ◽  
Ph Values ◽  
End Point ◽  
Weak Bases ◽  
Strong Acids

Juglone and lawsone, both acid-base indicators, obtained from natural sources and give pink and red colours with aqueous alkalies, respectively. Their transition ranges are found to be pH 7.4–8.2 and 2.6–3.4. To establish the transition intervals, a buffer series ranging in the pH values from 2.0–2.2–2.4–2.6–2.8–3.0–3.2–3.4–3.6–3.8–4.0–4.2–4.4–4.6–4.8–5.0–5.2–5.4–5.6–5.8–6.0–6.2–6.4–6.6–6.8–7.0–7.2–7.4–7.6–7.8–8.0–8.2–8.4–8.6–8.8–9.0 has been used. Juglone can be used for the titrations of strong acids with strong bases and weak acids with strong bases and lawsone can be used for the titration of strong acids with weak bases only. Permanancy of the colours at the end point is one of their advantages.

scholarly journals Flower Extracts of Cage Plants (Canavalia virosa) as an Indicator of Acid Base

2020 ◽  
Vol 9 (4) ◽  
pp. 191-198
Author(s):  
Andi M. Rendi ◽  
Supriadi Supriadi ◽  
Suherman Suherman
Keyword(s):  
Strong Acid ◽  
Weak Acid ◽  
Acid Base ◽  
Buffer Solution ◽  
Strong Base ◽  
Flower Extract ◽  
Acid Titration ◽  
Acid Base Titration ◽  
Plant Flower ◽  
Light Green

Cage plants (Canavalia virosa) are classified as nuts. This study aims to prove the flowers of the cage plants as acid-base indicators and determine the type of acid-base titration that is suitable for indicators of cage plants. The flowers of the cage plants were macerated with ethanol. Extras were tested as indicators in acid-base solutions, buffer solutions, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acid with a strong base, a weak acid with a strong base, and weak base with strong acid. The results obtained in this study, namely: flower extracts of cage plants in strong red acid, in weak acid pink, in strong green bases, and weak bases in light green. In a buffer solution of pH 1 to pH 11, the flower extract of the cage plants gives 4 color groups, namely: a buffer solution with pH 1 colored red, pH 3 colored pink, pH 5 to pH 9 being light green, and pH 11 being dark blue. Cage plant flower extract can be used as an indicator of acid-base, cage plant flower extract can be used on strong-base strong acid titration, strong weak-acid base, and weak-strong base acid titration.

scholarly journals Use of Argyreia cuneata Flower Extract as a Natural Indicator in Acid Base Titration

2014 ◽  
Vol 4 (2) ◽  
pp. 1124-1127 ◽  
Author(s):  
N.V.Pimpodkar . ◽  
B.S.Surve . ◽  
S.H.Bhise .
Keyword(s):  
Acid Base ◽  
Flower Extract ◽  
Acid Base Titration

scholarly journals Utilization of Extract of Sambang Getih Leaves (Hemigraphis colorata. Hall. F) as a Acid-Base Indicator

2020 ◽  
Vol 9 (1) ◽  
pp. 7-15
Author(s):  
Eksari Ekasari ◽  
Purnama Ningsih
Keyword(s):  
Leaf Extract ◽  
Strong Acid ◽  
Weak Base ◽  
Acid Base ◽  
Strong Base ◽  
Unique Color ◽  
Acid Base Titration ◽  
Naoh Solution ◽  
Ph Range ◽  
Color Pigment

Getih sambang leaves (Hemigraphis Colorata. Hall. F) are plants that have a distinctive and unique color, namely the upper surface of the leaf is green and the bottom of the leaf is burgundy where sambang leaves contain anthocyanin compounds. Anthocyanin is the color pigment in plants that forms the basis of the use of natural indicators. This study aims to prove whether getih cucumber leaves can be used as an acid-base indicator, to determine the type of acid-base titration that is suitable for indicators of getih cucumber leaves, and to find out what the pH-changing color route of getih cucumber leaves is. The method used is extraction, namely maceration. Wee leaves are macerated by using methanol as a solvent for 24 hours. The extract was previously tested using HCl solution and NaOH solution as a test to prove the presence of anthocyanin. The results obtained in this study, getih sambang leaf extract can be used as an indicator of acid base, and also the type of acid-base titration that is suitable for use in the indicator of getih leaf extract extract precisely on the titration of strong-base strong acid, and strong weak base-acid It is best used as a substitute for the phenolphthalein indicator. In titration of strong and weak acids and bases, it is good to be used as a substitute for the indicator of methyl orange. The pH range obtained from the getih sambang leaf extract is pH 4-7 (red-purple).

scholarly journals Inventarisasi Tanaman Berpotensi Sebagai Indikator Asam-Basa Alami Di Kota Kupang

bionature ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Nur R. Adawiyah Mahmud ◽  
Ihwan Ihwan ◽  
Nur Jannah
Keyword(s):  
Color Change ◽  
Curcuma Longa ◽  
Piper Betle ◽  
Acid Base ◽  
Sesbania Grandiflora ◽  
Base Solution ◽  
Synthetic Indicator ◽  
Acid Base Titration ◽  
Acid And Base ◽  
Bougainvillea Spectabilis

Abstract.  This study investigated a natural acid-base indicator which is extracted from plants in Kupang city. There are 14 plants that potential as a source of natural indicator for acid base titration, i.e, Kol Ungu (Brassica oleracea Capitata Group), Turi Merah flower (Sesbania grandiflora L. Pers), Belimbing Wuluh flower (Averhoa bilimbi L), Kaktus Merah fruit (Opuntia vulgaris Mill), Ruelia flower (Ruellia simplex), Flamboyan flower (Delonix regia), bugenvil flower (Bougainvillea spectabilis Willd.), Bayam Merah leaves (Amaranthus tricolor L.) Jamblang fruit (Syzygium cumini L.), Murbey fruit (Morus alba L.), Pinang fruit (Areca catechu L.), Sirih fruit (Piper betle L.), Kunyit (Curcuma longa Linn), and Nanas Kerang leaves (Rhoeo discolor). Plants extract shows a sharp color change in acid and base solution. Promising results as a natural indicator also shown in acid base titration which is have similar equivalent point to synthetic indicator. We can use these natural indicators as an alternative to synthetic indicator because they are found to be simple, very useful, cheap, easy to extract, accurate, and eco-friendly. Keywords: Plant, Natural indicator, Acid-Base

Hamelia patens Jacq Flower Extract as Indicator for Acid-Base Titration and Development of Litmus Paper

2019 ◽  
Vol 11 (3) ◽  
pp. 178
Author(s):  
Kadam Satwashila Shahajirao ◽  
Rupnar Kajal Gorakh ◽  
Salonkhe Snehal Ramchandra ◽  
Patil Shitalkumar Shivgonda
Keyword(s):  
Acid Base ◽  
Flower Extract ◽  
Acid Base Titration ◽  
Litmus Paper

scholarly journals Senna FLOWER EXTRACT AS AN INDICATOR FOR ACID-BASE TITRATION

2021 ◽  
Vol 14 (02) ◽  
pp. 1402-1407
Author(s):  
N. Pattarapongdilok ◽  
P. Malichim ◽  
N. Simmee ◽  
J. Sichaem
Keyword(s):  
Acid Base ◽  
Flower Extract ◽  
Acid Base Titration

scholarly journals The Potential of Clitoria ternatea L. Extracts as an Alternative Indicator in Acid-Base Titration

2021 ◽  
Vol 5 (4) ◽  
pp. 340-352
Author(s):  
Camalin Bela Sukmaning Fitri* ◽  
Retno Aliyatul Fikroh
Keyword(s):  
Experimental Design ◽  
Base Material ◽  
Chemistry Curriculum ◽  
Acid Base ◽  
Flower Extract ◽  
Synthetic Indicators ◽  
Base Materials ◽  
Acid Base Titration ◽  
Acid And Base ◽  
Butterfly Pea

Experiments are an important part of the chemistry curriculum. An indicator in the form of a synthesis indicator is commonly used in acid-base materials experiments. The usage of synthetic indicators can result in waste that is both environmentally harmful and costly. The butterfly pea flower is one of the plants that contains anthocyanins, which have the potential to be used as an alternative indication of natural acids and bases. The study aims to determine the acid and base material curriculum and competency indicators, as well as the potential of butterfly pea flower extract as a substitute for synthesis indicators and the practicality of butterfly pea flower extract as a chemical experimental design in SMA/MA. This study employs a descriptive qualitative research method that includes literature review, observation, experimentation, and interviewing. The results showed that the relationship between acid-base materials and experiments was the determination of natural materials as acid-base indicators, the pH of the solution, the identification of acid-base properties, and acid-base titration. The butterfly pea flower indicator was produced from maceration extraction using 96% ethanol as the solvent. The butterfly pea flower indicator gives pink color at pH 1-2, reddish purple at pH 3, light purple at pH 4-5, turquoise at pH 6, bluish green at pH 7, light blue at pH 8-9, green at pH 10, yellowish green at pH 11, greenish yellow at pH 12-13, and yellow at pH 14. The titration step showed that butterfly pea flower indicators could replace synthetic indicators, namely phenolphthalein and methyl orange. Based on the analysis, the butterfly pea flower indicator can be used as an alternative indicator in acid base titration and an alternative experimental design in schools.

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