Other Chemistry Answers

gas sample analysis methods in analytical chemistry

calcium hydroxide is manufactured by heating calcium carbonate strongly to produce calcium oxide, and then adding a controlled amount of water to produce calcium hydroxide.
CaCO3(s)=CaO(s)+CO2(g)
CaO(s)+H2O(i)=Ca(OH)2(s)
a.) what mass of water would you produce from 1 tonne of calcium carbonate?
b.) what mass of water would you need to add to that calcium oxide?
c.) What mass of calcium hydroxide would you eventually produce?
(RAMs: H=1, C=12, O=16, Ca=40.)

What is the molarity of 25 g of NaNO3 is dissolved in 400 ml of solution?

How many moles are 1.20x10 to the 25 power atoms of phosphorous

The determination in problem 15-9 was modified to
use the standard addition method. In this case, a 4.236 g tablet was dissolved in sufficient
0.10M HCl to give 1.00 L. Dilution of 20.00 mL aliquot to 100 mL yielded a solution
that gave reading of 448 at 347.5 nm. A second 20.00 mL aliquot was mixed with 10 mL
of 50 ppm quinine solution before dilution to 100 mL. The fluorescence intensity of this
solution was 525. Calculate the percentage of quinine in the tablet.

The solubility product constant KS for BaF2 is 1.70*10^–6. How much barium
difluoride can be dissolved in 2.00 liters of pure water?

Calculate the molar concentration of each ion (Na+ and PO4 3-) in a aqueous Na3PO4 solution when 2.0 g of Na3PO4 is dissolved in water so that the final volume of the solution is 150 ml.

how many molecules are in 23 moles of oxygen

give a balanced equation for the folowing:
1)methane burns in oxygen
2)sodium piece is added to water
3)barium chloride reacts with sodium sulphate
4)carbonmonoxide combines with hydrogen forrming methyle alcohol at apressure of 340 atmosphere

Sodium Fluoride is used in many types of toothpaste to give them basic pH. Sodium ions do not affect the pH of the solution. Prove that fluoride ions shift pH into basic range by finding pH of the 0.023mol/l solution of sodium fluoride.