5.0 g of sodium hydroxide M o l a r m a s s 40 g m o l - 1 is dissolved in little quantity of water and the solution is diluted up to 100 m l . What is the molarity of the resulting solution?

Question

5.0 g of sodium hydroxide M o l a r m a s s 40 g m o l - 1 is dissolved in little quantity of water and the solution is diluted up to 100 m l . What is the molarity of the resulting solution?, 0.1 m o l d m - 3, 1.0 m o l d m - 3, 0.125 m o l d m - 3, 1.25 m o l d m - 3

MARKS App · Accepted Answer

Molarity = N o . o f m o l e s p e r l i t r e S o l u t i o n No. of moles = M a s s M o l a r m a s s = 5 40 g m o l - 1 = 0.125 m o l The solution is diluted up to 100 ml. Hence, 100 ml consists of 0.125 mol of NaOH. 1 L consists of 'x' mole of NaOH ∴ x = 0.125 × 1000 m l 100 m l = 1.25 m o l d m - 3

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