Ten grams of sodium hydroxide dissolved in $1 L$ of water makes a solution that is:

0.25 M

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0.5 M

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1 M

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1.5 M

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4 M

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Solution

The correct option is A $0.25 M$
The molecular weight of $N a O H$ is 40 g/mol.
The number of moles of $N a O H = \frac{10 g}{40 g / m o l} = 0.25 m o l$
The molarity of $N a O H = \frac{0.25 m o l}{1 L} = 0.25 M$ .

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N a O H = 40

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