Question

how many kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution?

Answer 1

Answer: The kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.

Explanation:

According to the ratio and proportion:

$C_1m_1=C_2m_2$

where,

$C_1$ = concentration of ist solution = 25%

$m_1$ = mass of ist solution = 8 kg

$C_2$ = concentration of second solution = 40%

$m_2$ = mass of second solution = ? kg

$25\times 8=40\times m_2$

$m_2=5kg$

Thus the final solution must have a mass of 5 kg , i.e (8-5)= 3 kg of mass must be evaporated.

Therefore, the mass that must be evaporated from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.