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Calculate NaOH concentration

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How do you calculate the NaOH concentration (MW=40.00) of a solution that has 4g of solid NaOH dissolved in 200 mL of water?

and then to prepare the primary standard, how do you calculate the expected mass of benzoic acid required to react in stoichiometric proportion with 20 mL of the NaOH solution (MW = 122.12)?

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The equivalent weight of sodium hydroxide is the molecular weight divided by the number of replaceable hydroxide ions which is 1 in this case. So equivalent weight is 40.


40 grams dissolved in 1000 mL of water gives a solution whose molarity is 1 i.e 1 molar
4 grams dissolved in 100 mL of water gives a ...