1.

In what ratio should a 15% solution of acetic acid be mixed with a 3% solution of the acid to prepare a 10% solution (all percentage are mass/mass percentage) :

Answer»

`7:3`
`5:7`
`7:5`
`7:10`

SOLUTION :`(15/60xx1000/100V_1+3/60xx1000/100V_2)/(V_1+V_2)=10/60xx1000/100`
or `1/4V_1+1/20V_2=1/6(V_1+V_2)` or `V_1/4-V_1/6=V_2/6-V_2/20`
or `(6V_1-4V_1)/24=(10V_2-3V_2)/60` or `(2V_1)/24=(7V_2)/60` or `V_1/V_2=7//5`


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