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From Wikipedia

Calcium citrate

Calcium citrate is the calcium salt of citric acid. It is commonly used as a food additive (E333), usually as a preservative, but sometimes for flavor. In this sense, it is similar to sodium citrate. Calcium citrate is also used as a water softener because the citrate ions can chelate unwanted metal ions. Calcium citrate is also found in some dietary calcium supplements (e.g. Citracal). Calcium makes up 21% of calcium citrate by weight.

Chemical properties

Calcium citrate is an odorless white powder soluble in cold water.

Like citric acid, calcium citrate has a sour taste. Like other salts, however, it also has a salty taste. For this reason, citrates such as sodium and calcium citrate are commonly known as sour salt. This should not be confused with the product commonly found in grocery stores labled as "sour salt," which is simply powdered citric acid (which only resembles salt superficially).

Production

Calcium citrate is an intermediate in the isolation of citric acid from the fermentation process by which citric acid is produced industrially. The citric acid in the broth solution is neutralized by calcium hydroxide, precipitating insoluble calcium citrate. This is then filtered off from the rest of the broth and washed to give clean calcium citrate.

The calcium citrate thus produced may be sold as-is, or it may be converted to citric acid using dilute sulfuric acid.

Biological role

In many individuals, Bioavailability of calcium is found to be equal to that of the cheaper calcium carbonate. However, alterations to the digestive tract may change how calcium is digested and absorbed. According to recent research into calcium absorption after gastric bypass surgery, calcium citrate may have improved bioavailability over calcium carbonate in Roux-en-Y gastric bypass patients who are taking calcium citrate as a dietary supplement after surgery. This is mainly due to the changes related to where calcium absorption occurs in the digestive tract of these individuals.



From Yahoo Answers

Question:I'm doing a science fair project , and I want to do it on making a "fuel gel" out of easily available materials. I have attempted to make the gel using various different methods, such as crushed eggshells, vinegar and denatured alcohol, or calcium acetate and denatured alcohol and some other versions, but I still have not been able to produce a "fuel gel"... Does anyone have any other tips or suggestions on how to make one???

Answers:I have a book that says use 9 parts ethyl alcohol (you could use denatured) to one part Calcium Acetate saturated solution. The keys are saturated Calcium acetate, and at least 95 % alcohol. You have to add a lot of calcium acetate to water to saturate it. I have done this, and it did work, so keep trying.

Question:If I want to make a buffer solution having 0.5 mM ( in which I need 1:1 eq ratio of sodium acetate and acetic acid). How many gram I have to take if sodium acetate appears as CH3COONa 3H2O powder. Do I add the 3 H20 molecules weight when I calculate the mass I have to take with respect to the mole needed ? Please explain the calculation

Answers:Don't worry too much about the 3H20 hydrate in your total water volume it is very little. If you are making one liter of 0.5mM of each sodium acetate and acetic acid then look up the M.W. of each, and weigh out 0.5mmole of each. You do need to include the hydrate in your M.W. of Sodium Acetate since one molecule of the hydrate will contain one molecule of Sodium Acetate.

Question:Could you please show me step by step your result.

Answers:Ca is +2 Acetate is -1 and has 2 oxygens, so there will be 4 oxygens total for calcium acetate. CH3CH2C(O)O- = acetate; 2 oxygens Ca(CH3CH2C(O)O)2; 4 oxygens

Question:I know that I need vinegar and baking soda, but I want to know how much I should use? Like I want to make about a glass full of this stuff so how many grams of baking soda and milliliters of vinegar do I need? This is for the "Hot Ice" experiment.

Answers:This is the reaction: 2CH3COOH(aq) + Na2CO3(s) ---> 2NaCH3COO(aq) + H2O(l) + CO2(g) Vinegar is typically about 5% acetic acid by volume, and 95% water. So, your sodium acetate solution will end up being pretty dilute. If you use one cup of vinegar (about 240mL), that's about 12mL of acetic acid, which is (at about 1g/mL and 60g/mol) 0.20mol. Which would require 0.10mol , or (at 108g/mol) 11g of baking soda. At 5g/tsp, that's a little more than 2tsp of baking soda.

From Youtube

how to make calcium hydroxide :DO NOT ATTEMPT THIS WITHOUT EXTENSIVE SAFETY EQUIPMENT. calcium hydroxide can be bought in large amounts for use in construction. this method is for demonstration purpose only and is greatly ineffective. to preform this experiment, heat calcium carbonate at over 1500 degrees for over an hour to form calcium oxide. add this to water to form calcium hydroxide. the reaction between calcium oxide and water is highly exothermic and can be explosive if done to quickly. a face mask and gloves at the least must be worn at all times

How to Make Calcium Carbonate :Was out down south and thought i sould take some chemistry to their, i went to bunnings to look for calcium carbonate and saw 2kg for $13, but it said only 37% CaCO3 so i thought that was shit, so i thought, how could i make it easy...... sea shells, so i collected heaps to do this reaction to get almost pure CaCO3 CaCO3 +2 HCl = CO2 + CaCl2 + H2O CaCl2 + NaHCO3 = CO2 + CaCO3 + H2O + NaCl Enjoy