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An aqueous solution of sodium hydroxide contains 20% NaOH by mass. It is desired to produce an 8% NaOH solution by diluting a stream of

An aqueous solution of sodium hydroxide contains 20% NaOH by mass. It is desired to produce an 8% NaOH solution by diluting a stream of the 20% solution with a stream of pure water.

a) Calculate the amount of water required?

b) The exit product is sent to an evaporator to concentrate the NaOH again to 30% Find the amount of water evaporated?

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