Question

Raw pressed lemon juice contains 10 wt% solids. It is desired to inrease that amount to 20 wt% by evaporation. If a small juice company wants to produce 1000L of 20 wt% juice per day, then how much raw pressed lemon juice would they need? (Assume density of all streams is 1 kg/L)

Answer 1

Assume that they need V L of raw pressed lemon juice. It contains 10 wt% solids.
Solids present g .....(1)
(as density of all streams is 1 kg/L, w/w % = w/v %)
1000L of 20 wt% juice corresponds to solids of g.....(2)
(1) = (2)

Hence, they need 2000 L of raw pressed lemon juice.