Answer :

Here are the equations for copper sulphate solution reacting with sodium hydroxide solution:

copper sulfate + sodium hydroxide copper hydroxide + sodium sulfate

CuSO4 + 2NaOH Cu(OH)2 + Na2SO4

(15.95g + 8g 9.75g + 14.2g)

23.95g = 23.95g

As all the reactants and products remain in the sealed reaction container then it is easy to show that the total mass is unchanged. This data shows the law of conservation of mass.

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