pH - SAT Subject Test in Chemistry
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Question
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?
A scientist makes a solution by adding 0.2 grams of
Answer
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 
. This means that the concentration of 
ions is 
and 
. Thus, the pH of the solution is 11.
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