The Thermochemical Calculations to Follow up Water Treatment by the Calcium Carbonate (Calcium Hydroxide and Calcium Oxide)

The research is focused on the use of experimental calcium cycle in chemistry teaching at the lower secondary school. The cycle is based on four reactions: 1. thermal decomposition of calcium carbonate, 2. reaction of calcium oxide with water, 3. calcium hydroxide with hydrochloric acid, 4. reaction of calcium chloride with sodium carbonate. The calcium cycle was tested at lower secondary schools (and equal classes from comprehensive schools). Despite the difficulty of taking some steps, the cycle was accepted by both teachers and learners. Keywords: chemistry teaching, experimental cycle, calcium cycle, lower secondary education.

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Liquidus temperatures in the calcium carbonate-calcium hydroxide-calcium oxide and calcium carbonate-calcium sulfate-calcium sulfide ternary systems. 2

Industrial & Engineering Chemistry Process Design and Development ◽

10.1021/i200014a007 ◽

1981 ◽

Vol 20 (3) ◽

pp. 443-445 ◽

Cited By ~ 3

Author(s):

M. C. Fuerstenau ◽

C. M. Shen ◽

B. R. Palmer

Keyword(s):

Calcium Carbonate ◽

Calcium Hydroxide ◽

Calcium Oxide ◽

Calcium Sulfate ◽

Ternary Systems ◽

Calcium Sulfide ◽

Liquidus Temperatures

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Controlled preparation of micro–nano hierarchical hollow calcium carbonate microspheres by pressurized-CO2 carbonization and their CaCO3:Eu3+ photoluminescence properties

CrystEngComm ◽

10.1039/d0ce01854f ◽

2021 ◽

Vol 23 (16) ◽

pp. 3033-3042

Author(s):

Liubin Shi ◽

Mingde Tang ◽

Yaseen Muhammad ◽

Yong Tang ◽

Lulu He ◽

...

Keyword(s):

Carbon Dioxide ◽

Calcium Carbonate ◽

Calcium Hydroxide ◽

Hierarchical Structure ◽

Ethylenediaminetetraacetic Acid ◽

Disodium Salt ◽

Hollow Microspheres ◽

Photoluminescence Properties ◽

Controlled Preparation

Herein, calcium carbonate hollow microspheres with a micro–nano hierarchical structure were successfully synthesized using disodium salt of ethylenediaminetetraacetic acid (EDTA-2Na) as an additive, by bubbling pressurized carbon dioxide and calcium hydroxide at 120 °C.

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PREPARATION OF PRECIPITATED CALCIUMCARBONATE USING ADDITIVE AND WITHOUT ADDITIVE

Jurnal Teknologi ◽

10.11113/jt.v77.6004 ◽

2015 ◽

Vol 77 (3) ◽

Cited By ~ 2

Author(s):

Anuar Othman ◽

Nasharuddin Isa ◽

Rohaya Othman

Keyword(s):

Calcium Carbonate ◽

Calcium Hydroxide ◽

Mineral Composition ◽

Hydrated Lime ◽

Raw Material ◽

Precipitated Calcium Carbonate ◽

Uniform Size ◽

The One

Precipitated calcium carbonate (PCC) chemically can be synthesized in the laboratory. In this study, hydrated lime or calcium hydroxide was used as raw material with sucrose as additive to produce PCC. The process was compared with the one without additive. PCC produced was observed based on morphology, mineral composition and size by using Fesem-Edx and LPSA, respectively. PCC products without additive demonstrated fine and more uniform size of calcite PCC as compared to the one with additive. Nevertheless, the process with additive produced more PCC product than without additive.

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Technical Note: Common Water Treatment Chemicals and Calcium Carbonate Saturation

American Water Works Association ◽

10.5942/jawwa.2017.109.0143 ◽

2017 ◽

Vol 109 ◽

pp. 38-43

Author(s):

R. Rhodes Trussell ◽

John D. Kenny ◽

David R. Hokanson

Keyword(s):

Calcium Carbonate ◽

Water Treatment ◽

Technical Note

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Diffusion of Handwashing Knowledge and Water Treatment Practices From Mothers in an Antenatal Hygiene Promotion Program to Nonpregnant Friends and Relatives, Machinga District, Malawi

International Quarterly of Community Health Education ◽

10.1177/0272684x18797063 ◽

2018 ◽

Vol 39 (1) ◽

pp. 63-69

Author(s):

Anu Rajasingham ◽

Janell A. Routh ◽

Anagha Loharikar ◽

Elly Chemey ◽

Tracy Ayers ◽

...

Keyword(s):

Water Treatment ◽

Maternal Health ◽

Service Use ◽

Free Water ◽

Antenatal Clinic ◽

Maternal Health Service ◽

Middle Income ◽

Treatment Practices ◽

Hygiene Practices

Access to safe drinking water and improved hygiene are essential for preventing diarrheal diseases in low- and middle-income countries. Integrating water treatment and hygiene products into antenatal clinic care can motivate water treatment and handwashing among pregnant women. Free water hygiene kits (water storage containers, sodium hypochlorite water treatment solution, and soap) and refills of water treatment solution and soap were integrated into antenatal care and delivery services in Machinga District, Malawi, resulting in improved water treatment and hygiene practices in the home and increased maternal health service use. To determine whether water treatment and hygiene practices diffused from maternal health program participants to friends and relatives households in the same communities, we assessed the practices of 106 nonpregnant friends and relatives of these new mothers at baseline and 1-year follow-up. At follow-up, friends and relatives were more likely than at baseline to have water treatment products observable in the home (33.3% vs. 1.2%, p < 0.00001) and detectable free chlorine residual in their water, confirming water treatment (35.7% vs. 1.4%; p < 0.00001). Qualitative data from in-depth interviews also suggested that program participants helped motivate adoption of water treatment and hygiene behaviors among their friends and relatives.

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