Question

3. In a saturated solution of the ionic compound sodium sulfate,
Na_{3}PO_{4}

all of the water molecules are involved in the hydration process.

some solid Na_{3}PO_{4} is present.

all of the above

the concentration of Na^{+} is three times the
concentration of PO_{4}^{3-}.

4. A solution contains 85 grams sucrose and 100. grams of water. What is the mass percent of the sucrose solution?

5. A solution contains only glycerol and fructose. There is ten times as much glycerol as fructose. Therefore,

glycerol is a solute.

both glycerol and fructose are solutes.

fructose is the solvent.

glycerol is the solvent.

6. A strong electrolyte is a solute that

dissolves in water as molecules only.

dissolves fully in water as ions only.

dissociates partially in water.

does not dissolve in water.

7. At 60^{o}C, NaNO_{3} has a solubility of 110
grams NaNO_{3} per 100 grams of water. How many grams of
NaNO_{3} are needed to prepare a saturated solution using
50. grams of water?

8. How many mL of 0.160 M HCl solution are needed to provide 1.50 mole of HCl?

9. To what volume would you dilute 250.0 mL of a 0.4500 M NaOH solution to obtain a 0.2700 M solution?

10. How many grams of NaNO_{3} are needed to prepare a
95.00 mL solution that is 9.5% (m/v)?

11. A 140.0 mL sample of a 0.85 M H_{2}SO_{4}
solution is diluted with enough water to reduce the concentration
of the solution to 0.65 M. What is the volume of the diluted
H_{2}SO_{4} solution?

12. How many milliliters of a 0.220 M NaCl solution are required in order to supply 35.0 grams of NaCl for a reaction?

13. How many liters of a 0.950 M KCl solution can be made from 65.0 grams of KCl?

14. A solution contains 0.030 mEq/L of Sn^{2+} ion. How
many moles of Sn^{2+} ion are in a liter of this
solution?

15. A semipermeable membrane separates a 4% starch solution and a 2% starch solution.

Initially water will flow from the 2% starch solution to the 4% starch solution.

The water level of the 2% starch solution will rise.

The 2% starch solution will be diluted.

All of these are true.

16. How many grams of solute are present in 757.0 mL of a 0.263
M H_{2}SO_{4} solution?

17. What is the volume percent of a solution containing 15.0 mL of ethanol in 45.0 mL water assuming the volumes are additive?

18. How many equivalents are in 3.0 g of
SO_{4}^{2-}?

19. How many grams of Li_{2}SO_{4} are needed to
prepare 275.0 mL of a 4.5% m/v Li_{2}SO_{4}
solution?

20. What type of mixture contains solute particles that are retained by a semipermeable membrane and that will settle out over time?

solution

colloidal

suspension

mixture

Answer #1

Ans 3 : the concentration of Na+ is three times the concentration of PO43-.

In the saturated solution , no more solute can be dissolved. The further addition of Na3PO4 will not cause its dissolution infact precipitation will occur.

Since Na3PO4 is an ionic compound , it dissociates in the solution as :

Na3PO4 = 3Na^{+} + PO4^{-}

Since each mol of compound dissociates into 3 moles of sodium and 1 mol of phosphate ions , so the concentration of sodium ions is as much as three times the concentration of phosphate ions.

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