Q 204

How many millilitres of a 9.0 mol L^{-1} H_{2}SO_{4} solution are needed to make 0.35 L of a 3.5 mol L^{-1} solution?
A)0.14 mL
B)0.90 mL
C)140 mL
D)900 mL

Q 205

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150.mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?
A)0.274 mol L^{-1}
B)0.356 mol L^{-1}
C)2.81 mol L^{-1}
D)3.65 mol L^{-1}

Q 206

How many millilitres of a stock solution of 13.1 mol L^{-1} would be needed to prepare 0.500 L of 0.500 mol L^{-1} ?
A)0.0191 mL
B)52.4 mL
C)0.0524 mL
D)3.28 mL
E)19.1 mL