What mass of sodium hydroxide ( $NaOH$ ) is contained in 250 $cm^3$ of 0.02M sodium hydroxide solution?

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Answer 1 · 2017-01-11T08:04:06

Approx. $200*mg$ .

$"Concentration"$ $=$ $"Moles of solute"/"Volume of solution"$ .

And thus $"Moles of solute"="Volume of solution"xx"concentration"$ .

And thus $"Moles of NaOH"=250*cancel(cm^3)xx10^-3cancelL*cancel(cm^-3)xx0.02*mol*cancel(L^-1)=5.0xx10^-3*mol.$

$"Mass"="moles"xx"molar mass"=5.0xx10^-3*cancel(mol)xx40.0*g*cancel(mol^-1)=??g$

What mass of sodium hydroxide (NaOHNaOH) is contained in 250cm^3cm^3 of 0.02M sodium hydroxide solution?