Question

After testing an aqueous solution of ammonia, a company found that the percent by weight of the ammonia was 8% If it were possible, how much water would need to evaporate from the solution tocreate a 20% percent by weight of ammonia solution?Assume you start with 200 mL of the 8% solution in a beaker.A) 42 mlB) 84 ml.C) 120 mLD) 144 mL

Answer 1

Explanations:

The formula for calculating the dilution of a solution is given as:

`C_1V_1=C_2V_2`

where

C is the concentration of ammonia

V is the volume of solution

Convert the percent by weight of ammonia to concentration to have:

`\begin{gathered} C_1=8M \\ C_2=20M \\ V_1=200mL \end{gathered}`

Required

Final volume V2

Substitute the given parameters into the formula to have:

`\begin{gathered} V_2=(C_1V_1)/(C_2) \\ V_2=(8*200mL)/(20) \\ V_2=(1600)/(20) \\ V_2=80mL \end{gathered}`