Chemistry 30 – Solubility & Solutions
Dilution Questions Part 2
All answer should have proper significant figures!!
1. A stock solution of 7.00 mol/L NaCl is available. How many millilitres are
needed to make 400.0 mL of 0.750 mol/L?
2. Concentrated H2SO4 is 18.0 mol/L. What volume is needed to make 4.00 L of
0.005 mol/L solution?
3. A stock solution of 13.0 mol/L NaOH is prepared. From this solution, you need to
make 315.0 mL of 0.375 mol/L solution. How many mL will be required?
4. Write balanced chemical equations to show which ions are produced when the
following are dissolved in water.
a. Magnesium phosphate and Calcium hydroxide
b. Sodium bromide and Silver nitrate
c. Potassium chloride and Aluminium sulfide
5. Calculate the final concentration if 10.00 L of 1.8 mol/L NaCl and 4.00 L of
1.50 mol/L NaCl are mixed.
6. Find the concentration of K+ in each of the following;
a. Equal volumes of 0.30 mol/L Na2CO3 and 6.5 mol/L K2CO3
b. 30 mL of 0.20 mol/L Na2SO4 and 700 mL of 0.15 mol/L KNO3
c. 9.0 L of 0.80 mol/L K2CO3 and 3.0 L of 0.80 mol/L KCl
d. 3.0 mL of 0.000002 mol/L K2SO4 and 7.0 mL of 0.000003 mol/L K3PO4
7. Calculate the final concentration if 40.00 L of 3.15 mol/L NaCl, 26.00 L of 1.50
mol/L NaCl and 19.00 L of water are mixed.