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How many grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH? (Atomic weight: Na = 23, 0 + 16, H + 1)
1. 2
2. 20
3. 4
4. 1

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Correct Answer - Option 1 : 2

The correct answer is 2.

  • 2 grams of NaOH are needed to make 100 ml. of a 0.5 M solution of NaOH.
    Here, molarity is 0.5
    So, number of moles = 0.5*100 / 1000 = 0.05
    No. of moles = Mass / Molar mass
    So, mass of NaOH = 0.05*40 = 2 grams.

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