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4 g of NaOH are dissolved in 200 cm^3 of water. Find the molarity of the solution. |
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Answer» Solution :Mass of NaOH dissolved = 4g Molecular mass of NaOH = 23 + 16 +1 = 40 `THEREFORE` Moles of NaOH dissolved `=4/40 = 0.1` Volume of water taken `=200 cm^(3) = 200 xx 10^(-3) L` The molarity of the solution `=("No. of moles of NaOH")/("Volume in litres")` `=0.1/(200 xx 10^(-3))` `=0.5 mol L^(-1)` Hence, the given solution is 0.5 M |
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