How much water is needed for 0.1m sodium hydroxide
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Answer:
You need only 1/4 of that.
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0.1 M NaOH means to dissolve 0.1 moles NaOH in 1 liter of solution. Since you don't want to make 1 liter of solution, but want only 250 ml (0.25 liters), then you also don't need 0.1 moles NaOH. You need only 1/4 of that. So done by dimensional analysis, it looks like this...
0.1 moles/liter x 0.25 liters = 0.025 moles NaOH needed
The molar mass of NaOH is 23 + 16 + 1 = 40 g/mole
Thus, 0.025 moles NaOH x 40 g/mole = 1 gram NaOH
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
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