Problems Of Solution Concentration -What is the ratio of the concentration of po

Question

Problems Of Solution Concentration

-What is the ratio of the concentration of potassium ions to the concentration of carbonate ions in a 0.1275 M solution of Aluminium carbonate?

-What is the molar concentration of K+ ions in a 0.0175 M solution of potassium Phosphate?

-How many grams of Na2SO4 are required to make 1.250 L of 0.800 M Na2SO4?

-What is the concentration of ammonia in a solution made by dissolving 13.75 g of ammonia in 8.0 L of water?

-(a) How many grams of Na2SO4 are there in 250 mL of 0.50M Na2SO4? (b) How many milliliters of 0.50 M Na2SO4 solution are needed to provide 0.038 mol of this salt? (c)How many milliliters of 2.5M H2SO4 are needed to make 450mL of 0.20M H2SO4?

Explanation / Answer

How many grams of Na2SO4 are required to make 1.250 L of 0.800 M Na2SO4?

Molarity=moles/volume of solution in L

0.800=moles/ 1.250

moles= 0.800*1.250= 1 mole

weight= moles*molar mass= 1*142.04= 142.04 gm of Na2SO4

What is the concentration of ammonia in a solution made by dissolving 13.75 g of ammonia in 8.0 L of water?

Moles= given mass/ molar mass

molar mass of NH3=17.03 gm

moles=13.75/17.03= 0.80 moles

Molarity= moles/volume in L= 0.80/8= 6.4 M

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