A reagent-free acid-base titration method via an electrodialytic titrant generator

Talanta ◽  
2021 ◽  
pp. 122964
Author(s):  
Yue Sun ◽  
Zhenzi Xu ◽  
Feifang Zhang ◽  
Zongying Li ◽  
Bingcheng Yang
Keyword(s):  
Free Acid ◽  
Acid Base ◽  
Titration Method ◽  
Acid Base Titration

Determining surface areas of marine alga cells by acid-base titration method

Chemosphere ◽  
1997 ◽  
Vol 35 (5) ◽  
pp. 1131-1141 ◽  
Author(s):  
Xiulin Wang ◽  
Yanjun Ma ◽  
Yuenlan Su
Keyword(s):  
Marine Alga ◽  
Acid Base ◽  
Titration Method ◽  
Surface Areas ◽  
Acid Base Titration

scholarly journals Perbedaan Kadar Formalin pada Tahu yang Dijual di Pasar Pusat Kota dengan Pinggiran Kota Padang

2014 ◽  
Vol 3 (3) ◽  
Author(s):  
Siti Ardina Sari ◽  
Asterina Asterina ◽  
Adrial Adrial
Keyword(s):  
Formalin Test ◽  
Chromotropic Acid ◽  
Acid Base ◽  
Titration Method ◽  
Formaldehyde Content ◽  
Bivariate Data ◽  
Industry Research ◽  
Acid Base Titration ◽  
Qualitative Test ◽  
The Government

AbstrakTahu merupakan makanan yang digemari oleh masyarakat.Tahu mempunyai daya tahan sekitar 1 - 2 hari sehingga pedagang sering menambahkan formalin sebagai pengawet. Formalin merupakan bahan pengawet yang dilarang oleh pemerintah yang penggunaannya masih terdapat secara luas di masyarakat dan bila dilihat dari tekstur tahu yang dijual di pasar kota Padang, dicurigai tahu memiliki kandungan formalin.Tujuan penelitian ini adalah untuk mengetahui perbedaan kadar formalin pada tahu yang dijual di pasar pusat kota dengan pinggiran kota Padang. Penelitian ini dilakukan di laboratorium Balai Riset dan Standardisasi Industri Padang.Jenis penelitian ini adalah analitik yang telah dilaksanakan pada bulan Juni-September 2013. Jumlah sampel adalah sebanyak 36 buah yang terdiri dari 18 sampel tahu yang berasal dari pasar pusat kota dan 18 sampel tahu yang berasal dari pasar pinggiran kota Padang. Uji kualitatif formalin pada tahu dilakukan dengan metode asam kromatropat dan uji kuantitatif formalin menggunakan metode titrasi asam basa. Analisis data dilakukan secara bivariat dengan menggunakan uji t. Hasil penelitian didapatkan kadar formalin pada tahu di pasar pusat kota Padang dari 18 sampel yang diperiksa terdapat 17 sampel yang positif formalin dengan kadar paling tinggi adalah 3.65%. Kadar formalin pada tahu di pasar pinggiran kota Padang dari 18 sampel yang diperiksa terdapat 17 sampel yang positif formalin dengan kadar paling tinggi adalah 2.73%. Rata-rata kadar formalin pada pasar pusat kota adalah 1.08% dan pasar pinggiran kota adalah 0.67%.Kata Kunci: kadar formalin, tahu, pasar pusat kota Padang, pasar pinggiran kota PadangAbstractTofu is a favorite food among the community. Tofu has resistance 1 - 2 days so that merchant often add formalin as a preservative. Formalin is a preservative which is banned by the government that there is still widespread use in the community and the texture of tofu sold in the market is suspected for having formaldehyde content. The purpose of this study was to difference the levels of formaldehyde in tofu sold in downtown market and suburban market of Padang. This research was conducted in the laboratory Industry Research and Standardization Padang. This research is an analytic that has been conducted in June-September 2013. The number of samples of this study are 36 units consisting of 18 pieces of tofu samples derived from downtown market and 18 pieces of tofu samples derived from suburban market of Padang. Qualitative test performed with chromotropic acid method and quantitative formalin test using acid-base titration method. Bivariate data were analyzed using t test. The results showed that the levels of formaldehyde found in tofu sold in downtown market of Padang is from 18 samples tested there were 17 positive samples with the highest levels of formaldehyde was 3.65%. Levels of formaldehyde found in tofu sold in suburban market of Padang is from 18 samples tested there were 17 positive samples with the highest levels of formaldehyde was 2.73%. Average levels of formaldehyde in downtown market is 1.08% and suburban market is 0.67%. Keywords: formaldehyde level, tofu, downtown market of Padang, suburban market of Padang

scholarly journals Development of a micro-flow titration method and application to acid-base titration

2004 ◽  
Vol 53 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Hironobu KONISHI ◽  
Toshio TAKAYANAGI ◽  
Mitsuko OSHIMA ◽  
Shoji MOTOMIZU
Keyword(s):  
Acid Base ◽  
Titration Method ◽  
Acid Base Titration ◽  
Micro Flow ◽  
Flow Titration

Determination Methods of Dialdehyde Celluloses from Bacterial Cellulose

2007 ◽  
Vol 361-363 ◽  
pp. 507-510
Author(s):  
Yu Hong Feng ◽  
Jia Cheng Li ◽  
Qiang Lin ◽  
Su Juan Pang ◽  
Meng Ying Zhang ◽  
...  
Keyword(s):  
Bacterial Cellulose ◽  
Amino Nitrogen ◽  
Aldehyde Group ◽  
Acid Base ◽  
Titration Method ◽  
Cannizzaro Reaction ◽  
Acid Base Titration ◽  
Determination Methods ◽  
Oxidation System

This paper addresses the determination of aldehyde group (% of dialdehyde units) in dialdehyde cellulose (DACs) oxidized from bacterial cellulose (BC). With 4 determination methods, the oxidation degrees of DACs were studied: Automatic potential titration method through Schiff base reaction, Acid-base titration in Cannizzaro reaction, Metaperiodate consumption determination, and Measurement of amino nitrogen content in DAC derivatives. By comparing determination results of these methods, we found out the proper way suitable for this metaperiodate oxidation system of BC to measure the dialdehyde unit content of the DACs.

scholarly journals IDENTIFICATION OF THE SPREAD OF BORAX USE IN MEATBALL SKEWERS IN BANTUL DISTRICT, SPECIAL REGION OF YOGYAKARTA

2020 ◽  
Vol 17 (2) ◽  
pp. 120-130
Author(s):  
Sabtanti Harimurti ◽  
Imelda Horirotul Bariroh ◽  
Asep Setiyawan ◽  
Ratna Indah Permatasari ◽  
Friccillia Dwi Putri ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Acid Base ◽  
Titration Method ◽  
Decay Test ◽  
Two Samples ◽  
Acid Base Titration ◽  
Long Time ◽  
Rate Test ◽  
The Government ◽  
Special Region

Borax is an additive that is often added to some foods such as meatball skewers. The government has banned this ingredient from being added to food because it is harmful to health when consumed for a long time. This study aims to identify the use of borax in Bakso Tusuk or meatball skewers sold in Bantul area. Samples were drawn from 17 sub-districts in Bantul, Special Region of Yogyakarta. Two samples were taken from each sub-district, so the number of total samples was 34. The speed of decay test was carried out by observing the appearance of fungus, maggots, and consistency of the surface of meatball skewers. The presence of borax in the meatball skewers was done by turmeric paper and flame test, while the quantitative analysis utilized the acid-base titration method. Based on the results of the study, all samples tested positive for borax with concentrations between 0.06% - 5.15%, and the decay rate test showed that the speed of decay was independent of the level of borax.

Henderson Hasselbalch Relationship and Weak Acid Titration

2019 ◽  
Author(s):  
Marc Blétry
Keyword(s):  
Theoretical Framework ◽  
Weak Acid ◽  
Acid Base ◽  
Sensitive Technique ◽  
Chemistry Students ◽  
Advanced Students ◽  
Acid Titration ◽  
Acid Base Titration ◽  
Analytical Expressions

Henderson-Hasselbalch relation is generally the simplified theoretical framework used to introduce students to acid-base titration. However, it is not always valid and its limitations should be made clear to chemistry students. The appropriate parameter to evaluate its validity is K a /C 0 , in connection with Ostwald dilution law. For more advanced students, it is possible to deduce analytical expressions that always fit accurately acid-base titrations and allow an evaluation of Henderson Hasselbalch relation. Gran plot appears as a particularly sensitive technique to the breakdown of Henderson Hasselbalch relation.

Direct Synthesis of 3,5-Dinitropyrazole Catalyzed by Newly Sulfated Nanosolid Superacid TiO2/ SO

2011 ◽  
Vol 391-392 ◽  
pp. 1296-1301
Author(s):  
Li Min Xi ◽  
Xin Xin Zhang
Keyword(s):  
Direct Synthesis ◽  
Sol Gel ◽  
Acid Base ◽  
Direct Transformation ◽  
Acid Base Titration ◽  
Optimal Reaction Condition ◽  
Superacid Catalyst ◽  
Average Size ◽  
Optimal Reaction ◽  
Xrd And Tem

The newly sulfated nanosolid superacid TiO2/SO4 prepared by sol-gel method was broadly characterized by acid base titration, XRD and TEM, which identified that the superfine solid TiO2/SO4 showing good dispersibility with average size of 27 nm belongs to kind of crystalline nanoparticles. With the help of the catalyst TiO2/SO4, the optimal reaction condition for direct transformation of pyrazole and nitrosonitric acid into 3, 5-Dinitropyrazole was n (pyrazol)=0.10 mol, m (TiO2/SO4 )＝1.5g, V(n-octannol)＝90mL, and V(nitrosonitric acid)＝50mL. Moreover, the optimal yield of the catalytic reaction reached up to 59.4% when the reaction time is 7 hours. The nanosolid superacid catalyst is still of high activity after regenerating eight times by calcination at 600。C.

Acid-Base Titration Curves in Disproportionating Redox Systems

1994 ◽  
Vol 71 (8) ◽  
pp. 632 ◽  
Author(s):  
Tadeusz Michalowski ◽  
Andrzej Lesiak
Keyword(s):  
Redox Systems ◽  
Acid Base ◽  
Titration Curves ◽  
Acid Base Titration
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