Hydrate Essay
1. A 15,67g sample of hydrate of magnesium carbonate was carefully heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58g.What is the formula of the hydrate? (10)
2. Construct balanced equations (including state symbols) to describe the following reaction: Potassium metal reacts with water to form potassium hydroxide solution and hydrogen gas (dihydrogen). (8)
3. Anhydrous lithium perchlorate (4.78g) was dissolved in water and recrystallized. Care was taken to isolate all the lithium perchlorate as its hydrate. The mass of the hydrated salt obtained was 7.21g.What hydrate is it? (7)
4. Define a hydrated compound? (3)
5. Write the ions that are produced when the following substances dissolve. (6)
a) (NH4)3PO4
b) NaClO
6. If 5.00 grams of sodium hydroxide is dissolved to make 600mL of solution, what is its molarity? (6) 7. Define the following terms: (9) a) Solute b) Solvent
c) Solution
8. If 24.63g of magnesium chloride is dissolved to make exactly 3 litres of solution, calculate the concentrations of the ions in the solution (in moles/litre). (7)
9. Calculate the pH at 25 oC of 0.080 mol dm-3 HNO3. (7)
10. How many moles of hydrated copper sulphate (CuSO4.5H2O) are contained in 5.00g of the substance? (6)
11. Calculate the percentage composition by mass of nitrogen in ammonium nitrate, NH4NO3. (5)
12. What is the volume occupied by 0.25 mol of chlorine gas? (7)
13. What volume of hydrogen chloride gas is produced by the reaction of 40cm3 of chlorine with hydrogen? (First write a balanced equation). (10)
14. A sample of ammonia weighs 2.00g.What mass of sulphur dioxide contains the same number of molecules as are in 2.00g ammonia? (8)
Total:100
2. Construct balanced equations (including state symbols) to describe the following reaction: Potassium metal reacts with water to form potassium hydroxide solution and hydrogen gas (dihydrogen). (8)
3. Anhydrous lithium perchlorate (4.78g) was dissolved in water and recrystallized. Care was taken to isolate all the lithium perchlorate as its hydrate. The mass of the hydrated salt obtained was 7.21g.What hydrate is it? (7)
4. Define a hydrated compound? (3)
5. Write the ions that are produced when the following substances dissolve. (6)
a) (NH4)3PO4
b) NaClO
6. If 5.00 grams of sodium hydroxide is dissolved to make 600mL of solution, what is its molarity? (6) 7. Define the following terms: (9) a) Solute b) Solvent
c) Solution
8. If 24.63g of magnesium chloride is dissolved to make exactly 3 litres of solution, calculate the concentrations of the ions in the solution (in moles/litre). (7)
9. Calculate the pH at 25 oC of 0.080 mol dm-3 HNO3. (7)
10. How many moles of hydrated copper sulphate (CuSO4.5H2O) are contained in 5.00g of the substance? (6)
11. Calculate the percentage composition by mass of nitrogen in ammonium nitrate, NH4NO3. (5)
12. What is the volume occupied by 0.25 mol of chlorine gas? (7)
13. What volume of hydrogen chloride gas is produced by the reaction of 40cm3 of chlorine with hydrogen? (First write a balanced equation). (10)
14. A sample of ammonia weighs 2.00g.What mass of sulphur dioxide contains the same number of molecules as are in 2.00g ammonia? (8)
Total:100