Question

Calculate the amount of pure NA2CO:, required to prepare litre of 0.5 M saution.
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Answer 1

answer is 37

explanation: 0.5 M means 0.5 moles in 1 litre of solution

let the amount of na2co be x

no. of moles = x/m.w of na2co

no. of moles =x/74

0.5= x/74

this implies amount of na2co required is 37 gram.

hope it helps

Answer 2

Answer:

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