Question

What mass of sodium hydroxide is needed to prepare 2.0L of 0.25mol L-1 of NaOH solution?

Answer 1

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MOLARITY =

$\frac{w}{m \times v}$

MOLARITY= 0.25 mol/l

VOLUME = 2.0 L

MOLECULAR MASS OF NaOH IS = 40amu

THEN PUT ALL VALUES IN ABOVE EQUATION...

0.25 = W/(40×2)

W = 40×2×0.25gm

____________

| W = 20gm |

|___________|

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