Problem: Which of the following procedures will result in the largest change in pH? Adding NaNO2 to a solution of HNO2 in water or  Adding NaNO3 to a solution of HNO3 in water  

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Which of the following procedures will result in the largest change in pH?

Adding NaNO2 to a solution of HNO2 in water
or 
Adding NaNO3 to a solution of HNO3 in water

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