Search: Calcium

Number of results: 1,212

chemistry
the recommended daily allowance of calcium is 1.2 g. calcium carbonate contains 12.0 % calcium by mass. how many grams of calcium carbonate are needed to provide the rda of calcium
Monday, January 23, 2012 at 1:32am by Anonymous

CHEMISTRY
the correct name for the compound with the formula CaS04 IS A.]CALCIUM SULFUR OXIDE B.]CALCIUM SULFIDE C.}CALCIUM SULFATE D.}CALCIUM SULFUR TETROXIDE I will be happy to critique your thinking on this.
Friday, January 12, 2007 at 4:26am by Darius Graham

Chemistry
calcium carbonate decomposes if heated to form calcium oxide and carbon dioxide. if 24.5 grams of calcium carbonate decompose how many moles of calcium carbonate reacted?
Monday, January 21, 2013 at 9:54am by Channon

chemistry
Determine the number of moles of calcium per mole of calcium hydroxide. My answer is: Because there is only one calcium ion per mole of calcium hydroxide, the mole of calcium ion is equal to the mole of calcium hydroxide. Is this a correct justification?
Thursday, October 16, 2008 at 1:56pm by Anonymous

chemistry
whats thwe correct name for the salt with the formula CaI2 A.calcium diodide B. calcium iodine C.calcium iodide D. dicalcium iodine I will be happy to critique your thinking on this. calcium diodide
Friday, January 12, 2007 at 3:55am by Darius Graham

chemistry
It is worded oddly, and wrong. Let me correct it... Because there is only one calcium ion per formula unit of calcium hydroxide (Ca(OH)2), the number of moles of calcium per mole of calcium hydroxide is one.
Thursday, October 16, 2008 at 1:56pm by bobpursley

chemistry
Do you mean calcium sulfite (CaSO3) or calcium sulfate(CaSO4)? Your question states calcium sulfate but you have written calcium sulfite for the formula. I suspect that is a typo and you intend for it to be CaSO4.
Tuesday, July 1, 2008 at 1:29am by DrBob222

college
Look at the possible products: calcium citrate, calcium oxalate, and calcium tartrate. Are any of those insoluble in water? If so, a precipitate is formed. One of them is a problem in my making homemade wines.
Saturday, November 7, 2009 at 5:40am by bobpursley

chemistry
Hopefully, Dr. Bob222 corrects this if this is wrong. The maximum mass of calcium iodate that can dissolve in a 10L solution of calcium sulfide can not exceed the number of moles of calcium sulfide in the 10L solution. Therefore, solve for the number of moles in the solution. ...
Tuesday, January 29, 2013 at 3:50pm by Devron

Chemistry
If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?
Tuesday, March 29, 2011 at 2:11pm by John Goodroe

Chemistry
If 3.00 mol of calcium carbonate is heated to produce calcium oxide and carbon dioxide, how many grams of calcium oxide are produced?
Tuesday, March 29, 2011 at 2:08pm by John Goodroe

science
what happens when you mix calcium with oxygan Generally, one could expect Calcium Oxide (CaO) to form. In the presence of water, Calcium hydroxide will form.
Friday, July 15, 2005 at 5:29am by oli

chemistry
Please help me with this question. Give the formula for calcium phosphate and then answer the following questions: (a)Calculate the percent composition of each of the elements in this compound. (b)If you knew that there was 50.0g of phosphorus in your sample,how many grams of ...
Thursday, April 22, 2010 at 9:29pm by Kim

chemistry
Write the correct equation for the formation of a white precipitate on mixing together 10 mL each of 1 M calcium chloride, 1 M calcium bromide, 1 M calcium nitrate, 1 M sodium carbonate, 1 M potassium carbonate, and 1 M rubidium carbonate.
Tuesday, March 27, 2012 at 4:59pm by liz

chemistry
If calcium oxide is added to sea water a number of changes occur. first calcium oxide reacts with water to form calcium hydroxide. What is the equations
Sunday, March 8, 2009 at 5:49pm by mom

Chemistry
A solution contains an unknown amount of dissolved calcium . Addition of 0.112 mole of K3PO4 causes complete precipitation of all the calcium. How many moles of calcium were dissolved in the solution?
Saturday, May 14, 2011 at 5:09pm by Katie

General Chemistry
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3(s)+2HCl(aq)--> CaCl2(aq)+H2O (l)+CO2(g) How many grams of calcium chloride will be produced when 32.0 g of calcium carbonate are combined with 11.0 g of...
Wednesday, February 6, 2013 at 6:06am by Alexis

Chemistry
2NaF + CaCl2 ¨ CaF2 + 2NaCl An excess of 0.20 M NaF is used to precipitate the calcium ions from a 50.0 mL sample of a calcium chloride solution. What is the concentration of the original calcium chloride solution?
Sunday, July 10, 2011 at 9:42am by Neha

Chem
A 2.00 M solution of calcium choloride in water has a density of 1.17g/mL. What is the mole fraction of calcium chloride? How do I solve this? I know that density=mass/volume. The mm of calcium chloride is 111g/mol. I don't know how to connect this information.
Friday, April 25, 2008 at 9:46pm by Ginger

chemistry
For a lab in school we had to mix together sodium carbonate and calcium chloride and had that go through a filter, finally ending with our final product of calcium carbonate (chalk), my question is that we have to do a graph and the graph shows that as the mass of calcium ...
Tuesday, April 12, 2011 at 9:23pm by kay

chem
Calcium chloride is 36.0% calcium by mass. A 5.00g sample of calcium chloride contains what mass of chlorine?
Friday, May 25, 2012 at 10:26am by tenisha

chem
when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how many moles of calcium carbide are needed to completeley react with 5.00 * 10^22 water molecules?
Monday, April 19, 2010 at 2:11pm by 6784

Clinical Chemistry
This one seems like an easy question but I don't know where to start. Please help! In serum, about 55% of total serum calcium is bound. The measurement of ionized (free) calcium with an ISE is 1.10 mM. What is an estimate of the total calcium in this specimen?
Tuesday, April 9, 2013 at 8:21pm by Cosette

chem
when water is added to solid calcium carbide, CaC2, acetylene gas, C2H2, and calcium hydroxide, Ca(OH)2 are produced. how many moles of calcium carbide are needed to completely react with 5.00 * 10^22 water molecules? can someone explain the steps
Wednesday, April 14, 2010 at 10:58am by herjaz

chem
when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how many moles of acetylene are produced when 0.50 mole of calcium carbide reacts?
Monday, April 19, 2010 at 2:10pm by 6784

Chemistry
A solution of 100.00mL of 0.2000mol/L sodium carbonate and 200.00mL of 0.1000mol/L calcium nitrate solutions are mixed together according to the reaction: sodium carbonate + calcium nitrate→ calcium carbonate + sodium nitrate. how would you calculate the mass of ...
Monday, August 20, 2012 at 9:46am by Walker

Chemistry!
determine the new molarity of calcium ions when 50.0 mL of a 1.50 M calcium chloride solution are combined with 750.0 mL of a 0.236 M calcium phosphate solution.
Tuesday, December 14, 2010 at 5:24pm by Wade

physics
The diffusion coefficient for calcium ions crossing a biological membrane 10nm thick is 300 micrometers squared/second and the concentration difference of calcium ions across the membrane is 400 mol/m^2 (Molar mass of calcium is 40 kg/mol) Determine the number of moles of ...
Saturday, March 27, 2010 at 5:15am by Kelly

chemistry
A precipitate of calcium phosphate is formed when aqueous solutions of sodium phosphate and excess calcium chloride are mixed. If 100.0 mL of 1.5 M sodium phosphate solution is the limiting reactant, how many grams of calcium phosphate can be expected?
Friday, September 3, 2010 at 3:06pm by Ethan

chemistry 1
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction How many grams of calcium carbonate are needed to produce 49.0 of carbon dioxide at STP?
Sunday, May 2, 2010 at 7:04am by safwan hakim

Chemistry
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas. How many grams of calcium carbonate are needed to produce 81.0 of carbon dioxide at STP? Is the asnwer 80.95
Sunday, September 21, 2008 at 1:47am by George

chem
when water is added to solid calcium carbide, CaC2, acetylene gas, C2H2, and calcium hydroxide, Ca(OH)2 are produced. how many moles of acetylene are produced when 0.50 mole of calcium carbide reacts? can anyone explain this to me please
Wednesday, April 14, 2010 at 10:56am by herjaz

chemistry
calcium hydroxide reacts in a neutralization reaction with sulfuric acid in a 1:1 ratio to form water and calcium sulfate. if you have 23.5 grams of calcium hydroxide, how many milliliters of water can you form? how do i use dimensional analysis to solve this?
Friday, December 12, 2008 at 11:20am by lyne

Chemistry
Calcium chloride has been used to melt ice from roadways. Given that the saturated solution is 32% calcium chloride by mass, estimate the freezing point. Express your answer in degrees Celsius. Assume that calcium chloride behaves ideally in solution.
Tuesday, September 14, 2010 at 6:58pm by Frank

Chemistry 1201
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium carbonate needed to produce 53 L of carbon dioxide at STP?
Sunday, April 15, 2012 at 11:16pm by John

chemistry
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction \rm CaCO_3{\it(s)}\rightarrow CaO{\it(s)}+CO_2{\it(g)} How many grams of calcium carbonate are needed to produce 53.0 L of carbon dioxide at STP?
Friday, April 30, 2010 at 9:29pm by Anonymous

chemistry (science)
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3 ---> CaO + CO2 How many grams of calcium carbonate are needed to produce 73.0 of carbon dioxide at STP?
Monday, February 15, 2010 at 3:30pm by beeni

CHEM Help!
Sodium phosphate reacts with calcium nitrate to produce sodium nitrate and calcium phosphate. What would be the answer? Sodium phosphate is Na3PO4. Calcium nitrate is Ca(NO3)2 Calcium phosophate is Ca3(PO4)2. Sodium nitrate is NaNO3. Use this and the site I gave you above to ...
Tuesday, March 11, 2008 at 4:40pm by DrBob222

Chemistry
What volume of carbon dioxide is produced when 0.979 mol of calcium carbonate reacts completely according to the following reaction at 0oC and 1 atm? calcium carbonate (s)---> calcium oxide (s) + carbon dioxide (g) Should I use the ideal gas law?
Wednesday, April 25, 2012 at 8:58pm by Mohamed

Chemistry-Please help
When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)---->CaO(s)+CO2(g) How many grams of calcium carbonate are needed to produce 59.0L of carbon dioxide at STP?
Friday, October 16, 2009 at 1:37pm by Rose

Chemistry
I am translating the sentence "HF can be added to calcium carbonate to produce aqueous calcium fluoride carbon dioxide (CO2) and liquid water" into a chemical equation. I'm not sure how you write out Calcium Carbonate symbolically, or how you write clacium ...
Thursday, April 2, 2009 at 6:16pm by Gwen

Chemistry
4.How many grams of calcium chloride can be prepared if a student uses 500g if calcium carbonate and 2.00L of a 4.00 Mol/L sodium chloride solution in the reaction.?? Alex, could you check the question? Calcium carbonate does not react directly with sodium chloride to make ...
Friday, June 5, 2009 at 2:40am by MathMate

math
roated beef has 20g of protein and 11g of calcium per serving. serving of mashed potatoes has 2g of protein and 25g of calcium, how many servings of each are needed to supply 29 grams of protein and 61 grams of calcium?
Monday, October 1, 2012 at 9:09pm by deepa

Chemistry
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 + 2HCl -> CaCl2 + H2O + CO2 How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate are combined with 14.0 g of ...
Wednesday, October 3, 2012 at 12:39am by Anonymous

Chemistry
Calcium nitrate and ammoonium fluoride react to form calcium fluoride, dinitrogenmonoxide and water vapor. What mass of each substance is present after 28.42 g of calcium nitrate and 29.60 g of ammonium fluoride react completely?
Monday, October 26, 2009 at 7:36pm by Brittany

chemistry
In the absence of other information (temperature) write molecular formula for calcium hydroxide and complete the word equation below as a chemical equation. calcium hydroxide = calcium ions + hydroxide ions This will tell you how many moles of hydroxide ions are associated ...
Tuesday, March 18, 2008 at 11:06pm by Dr Russ

chemistry
Calcium reacts with water to yield calcium hydroxide and water according to the following equation: Ca + 2H2O ==> Ca(OH)2 + H2 . How many moles of hydrogen will be produced if 3115.8 grams of calcium hydroxide is produced?
Friday, January 25, 2013 at 1:18pm by charlene W

Chemistry
I am doing a lab report involving limiting reactants and percent compostition. The reactans are calcium chloride dihydrate and potassium oxalate monohydrate, which yeilds calcium oxalate monohydrate. My question is which product should i choose as my varied amount when doing ...
Friday, July 13, 2012 at 9:32pm by Leslie

Chemistry
Calcium carbonate is CaCO3. Calcium fluoride is CaF2.
Thursday, April 2, 2009 at 6:16pm by DrBob222

chemistry
Calcium bicarbonate Sulfuric acid Calcium chloride
Monday, February 4, 2008 at 6:35pm by drwls

chemistry
how much calcium is there in 2.30 L of 0.0450 M calcium hydroxide solution ? pdf
Monday, February 6, 2012 at 2:42pm by ashishs

Chemistry-please help
Can calcium react with chlorine gas to give calcium chloride?
Thursday, March 19, 2009 at 8:10am by Anne

Chemistry
Quick question here: Which has the higher reactivity, Calcium or Potassium? Is it calcium?
Monday, December 1, 2008 at 8:16pm by Anonymous

chemistry
calcium oxide reacts with water and with nitric acid. State the formula of the calcium compund when: (i) calcium oxide reacts with water (ii) calcium oxide reacts with nitric acid
Sunday, October 30, 2011 at 11:44am by anastasia

science
1. what weight in grams of magnesium oxide will produce from burning 96 grams of magnesium? 2. a solution containing 252g of calcium sulfate will produce from 165lbs of phosphate rocks containing 82.5 % pure calcium phosphate treated with sulfuric acid? 3. how many tons of ...
Sunday, August 28, 2011 at 1:07am by josh

Chemistry
How many moles of calcium chloride hexahydrate will be produced from 4.00 mol calcium carbonate?
Tuesday, April 3, 2012 at 3:23am by Jamaica

chemistry
how much calcium is htere in 2.30 L of 0.0450 M calcium hydroxide solution ? pdf
Monday, February 6, 2012 at 2:38pm by ashishs

Chemistry
How much calcium hydroxide is produced from 72.0g of calcium combinig with water?
Saturday, November 12, 2011 at 5:07pm by Camilla

chemistry
Calculate the solubility of calcium sulfate 0.010 mol/L calcium nitrate at SATP
Monday, April 7, 2008 at 8:02pm by Ross

chemistry
Calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP
Thursday, April 3, 2008 at 12:07pm by Lawrence94

science
Calcium phosphate comes up with the same formula as calcium carbonate...is that correct?
Sunday, December 16, 2007 at 8:09pm by jessica

Chemistry
Calcium Carbonate and aluminum silicate are mixed together and heated. A mixture of calcium oxide, carbon dioxide, aluminum oxide and calcium silicate is produced. Write the balanced equation for this reaction. My Work: 4CaCO3+Al2(SiO3)3->CaO(s)+4CO2(g)+Al2O3+3CaSio3 I ...
Saturday, January 29, 2011 at 5:20pm by Jim

Chemistry
I have no idea where to even start with this. It seems like it should be simple, but I have no clue. The question is... "In serum, about 55% of total serum calcium is bound. The measurement of ionized (free) calcium with an ISE is 1.10 mM. What is an estimate of the total...
Tuesday, April 9, 2013 at 5:04pm by Maranda

Gen Chemistry
52.8 mL of a calcium chloride solution with unknown concentration was treated with phosphoric acid to remove all of the calcium ions in the form of a precipitate. The precipitate was filtered, dried and was found to have the mass of 3.9565 g. What was the concentration of the ...
Saturday, December 11, 2010 at 9:06pm by Kevin

Chemistry
Calcium oxide (quicklime) reacts with water to produce calcium hydroxide (slaked lime). CaO(s) + H2O(l) Ca(OH)2(s) ÄH = -65.2 kJ The heat released by this reaction is sufficient to ignite paper. How much heat is released when 29.0 g of calcium oxide reacts?
Saturday, October 18, 2008 at 10:37pm by Glenna

Chemistry
How many grams of Calcium Chloride will be produce when 25 g of Calcium carbonate combine with 12 g of HCl
Saturday, July 14, 2012 at 2:45pm by Ja'Lon

chemistry
how to obtain calcium sulfate salt from the starting compound calcium carbonate? outline the steps taken.
Sunday, October 10, 2010 at 4:39am by dee

chemistry
How many grams of calcium oxide, CaO, can be produced from 4.20 g of calcium metal and 1.60 g of oxygen gas?
Sunday, September 21, 2008 at 9:15pm by Erika

Chemistry
Ca(C2H3O2). %Ca = [(mass Ca)/(mass calcium acetate)]*100 %H = [(mass H)/(mass calcium acetate)]*100 %O = [(mass O)/(mass calcium acetate)]*100 %C = [(mass C)/(mass calcium acetate)] *100 Use atomic mass for mass of the atoms multiplied by the number of atoms in calcium acetate...
Thursday, January 3, 2008 at 8:18pm by DrBob222

chemistry quick help!
In the balanced double replacement reaction of calcium chloride CaCl2 and aluminum sulfate Al2(SO4)3, how many grams of calcium sulfate can be produced if you start the reaction with 4.19 grams of calcium chloride and the reaction goes to completion?
Friday, January 25, 2013 at 2:03pm by thad

Chem hwk
In the balanced double replacement reaction of calcium chloride CaCl2 and aluminum sulfate Al2(SO4)3, how many grams of calcium sulfate can be produced if you start the reaction with 18.97 grams of calcium chloride and the reaction goes to completion?
Monday, January 28, 2013 at 2:58pm by Thad

Chemistry
A 0.41 g sample of limestone was dissolved in HCl and all the calcium in the limestone was converted to Ca2+(aq). The solution was treated with excess ammonium oxalate, (NH4)2C2O4(aq), and it was found that 3.0 g of calcium oxalate, CaC2O4(s) was precipitated. Calculate the ...
Thursday, September 20, 2012 at 12:18am by Bob

DrBob222-Questions
CaCl2 = Calcium ion and Chlorite ion You named MgCl2 magnesium chloride on the last post. Why would you not name this one calcium ion and chloride ion. Na2O = Sodium ion and Oxygen ion sodium ion and oxide ion AgCl = silver ion and chlorine ion silver ion and chloride ion ...
Tuesday, April 20, 2010 at 11:39pm by DrBob222

Chemistry
How many grams of Calcium Nitride can be produced using the calcium contained in 100 ml of a 4 Molar beryllium solution?
Sunday, April 15, 2012 at 3:00am by momo

Could someone help me proofread?
I think you should know that eggshell and teeth consist of quiet different chemical actually, eggshell is 94-97% Calcium carbonate while teeth is 98% Calcium Phosphate..Calcium phosphate (hydroxyapatite) react with fluoride and formed Fluoroapatite, which is stronger to acid ...
Thursday, December 28, 2006 at 2:13am by Donna

Gr 10 Chemistry
What is the balanced skeleton equation of Calcium hydroxide+ Phosphoric acid --> Calcium phosphate+ Water
Sunday, November 9, 2008 at 6:43pm by Pie

12 chemistry
What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?
Tuesday, April 24, 2007 at 9:20pm by Erica

chemistry
A 0.500 L solution of 7.50 M hydrochloric acid is used to neutralize a 250.0 g sample of calcium hydroxide. Calcium chloride – a chemical used to control highway dust, strengthen concrete mixes, and add flavor to foods – is produced by the reaction. 2 HCl + Ca(OH)2 &...
Monday, March 1, 2010 at 4:34pm by BT

chemistry
Hydrochloric acid reacts with calcium to form hydrogen and calcium chloride. If 100 grams of hydrochloric acid reacts with 100 grams of calcium, what is the limiting reactant? 2HCl + Ca --> CaCl2 + H2
Monday, June 18, 2012 at 10:15am by tyler

Chemistry
The acid-base reaction between phosphoric acid, H3PO4, and calcium hydroxide, Ca(OH)2, yields water and calcium phosphate. For each mole of calcium phosphate produced by this reaction, how many moles of water are also produced?
Saturday, September 19, 2009 at 10:02pm by Anonymous

CHEMISTRY
A 2.800-g mineral sample was analyzed for its calcium carbonate, CaCO3, content by titrating it with hydrochloric acid (the reaction products are calcium chloride, carbon dioxide, and water). The sample required 28.48 mL of a 0.1505 M HCl solution to react completely. ...
Sunday, November 28, 2010 at 7:45pm by Anonymous

chemistry
Determine the maximum mass of calcium iodate that can be dissolved in a 10.0L jug of 3.25x10^-2 molar calcium sulphide solution.
Tuesday, January 29, 2013 at 3:50pm by Kayleigh

Physical Science
Beach sand from the Caribbean is made of calcium remains of coral and shelled creatures. Vinegar is the acid and calcium is the base.
Monday, April 28, 2008 at 6:45pm by Vivian

chem
how do i write a balanced equation for the reaction for Calcium Carbide, CaC2, acetylene gas, C2H2, and calcium hydroxide, Ca(OH)2 are produced
Tuesday, April 13, 2010 at 9:41pm by jaime

Chemistry
yes the calcium carbonate has (MW= 100.09 g)hence the moles for CaCo3 is correct but how do you calculate the mole for calcium ion Ca2+
Monday, April 12, 2010 at 4:49pm by pem

calcium cloride
we are having a ice cream industry we are using calcium cloride to get -35 degree now we are getting -25 degree density of liquid is 1.210 how many kilo grams of calcium cloride to mix in liquid to get the density of 1.300 the liquid is nearly 3000 liters
Sunday, April 3, 2011 at 12:22am by chitti

Chemistry
Calcium carbide, CaC2, can be produced in an electric furnace by strongly heating calcium oxide (lime) with carbon. The unbalanced equation is CaO(s) + C(s) ¨ CaC2(s) + CO(g) Calcium carbide is useful because it reacts readily with water to form the flammable gas ...
Saturday, February 5, 2011 at 11:30am by Mariana

math
One more problem... An orange contains 50 mg of calcium and 0.5 mg of iron. An apple contains 8 mg of calcium and 0.4 mg of iron. How many of each are required to obtain 151 mg of calcium and 2.55 mg of iron?
Sunday, February 6, 2011 at 6:29pm by nellyp

Chemistry
How many grams of Calcium Chloride can be formed by reacting 50.05 g of Calcium carbonate with 900.00 ml of .8000 M hydrochloric acid
Monday, October 10, 2011 at 8:09pm by Anonymous

chemistry
how much calcium oxide is recovered when 250 g calcium hydroxide are heated given the following reaction? Ca(OH)2 arrow CaO + H2O
Monday, April 11, 2011 at 7:14pm by cam

chemistry
if you added sulfuric acid to calcium nitrate what products in addition to calcium sulphate would you get if any ? if you start with calcium nitrate mixed into H2SO4 (aq), wouldn't you get a solution of nitric acid? H2SO4 + Ca(NO3)2 >>> 2 HNO3(aq) + ...
Monday, August 13, 2007 at 11:33am by walter

chemistry
How many grams of solid sodium sulfate can be added to 1000L of a 0.02mol/L solution of calcium chloride before a precipitate forms? (Ksp for calcium is 6.1x10^-5)
Tuesday, July 27, 2010 at 10:32pm by Kat

chemistry
For the disadvantages check the link given to you by DrBob. The main advantage is that calcium ions in solution precipitate as calcium phosphate thus removed from the water.
Sunday, April 12, 2009 at 8:49pm by GK

chemistry
when water is added to solid calcium carbide, CaC2, acetylene gas,C2H2,and calcium hydroxide,Ca(OH)2, are produced. how do i write a balanced equation for the reaction.
Monday, April 19, 2010 at 2:09pm by 6784

chem
when water is added to solid calcium carbide, CaC2, acetylene gas, C2H2, and calcium hydroxide, Ca(OH)2 are produced. how do i write a balanced equation for the reaction.
Wednesday, April 14, 2010 at 10:55am by herjaz

CHEMISTRY
In some solid calcium carbonate samples, calcium bicarbonate, Ca(HCO3)2, is also present. Write a balanced euation for its reaction with hydrochloric acid.
Monday, March 8, 2010 at 2:02pm by jEFFREY

chemistry
Please help me and show me step by step. assume that the reactions are being performed at pressure of 1.2 atm and a temperature of 298K Calcium carbonate decomposes at a high temperature to form carbon dioxide and calcium oxide. How many grams of calcium carbonate will be ...
Sunday, May 9, 2010 at 9:27pm by Cris

Chem
Question: "Calculate the theoretical yield of calcium carbonate of you react 2.55g of calcium chloride dihydrate with an excess amount of sodium carbonate." I got the molar mass of calcium chloride dihydrate which is 131.015 g/mol, but Im not sure how to start the ...
Monday, October 8, 2007 at 5:47pm by Jenna

CHEMISTRY--PLEASE HELP, URGENT
A saturated solution of CaSO4(aq) is made in a beaker until there is excess calcium sulfate resting at the bottom. Then solid potassium sulfate is added. Which of the following is true? (The Ksp for potassium sulfate is larger than the Ksp for calcium sulfate) a. More calcium ...
Monday, April 12, 2010 at 10:39pm by Maggie

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