pH

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SAT Subject Test in Chemistry › pH

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A scientist makes a solution by adding 0.2 grams of to enough water so that the resulting solution has a volume of 10 liters. What, approximately, is the pH of this solution?

Explanation

has a molar mass of approximately 40 g/mol, meaning that there is 0.01 mol of it in the solution. Sodium hydroxide is a strong base and completely dissociates in water. Its concentration in the solution is $\frac{0.01}{10}=10^{-3}$ $\frac{mol}{L}$ . This means that the concentration of ions is $\frac{10^{-14}}{10^{-3}}=10^{-11}$ and $-\log (10^{-11}) = 11$ . Thus, the pH of the solution is 11.

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