Question
A solution of vinegar (acetic acid) has a pH of around
3. If the hydrogen ion concentration [H⁺ ] in the solution is increased 1000 times, what will be the new pH?Solution
The pH is calculated as: 
Sum of the present ages of A, B, C and D is 70 years. After 5 years ratio of their ages is 6:4:3:2. What is C’s present age?
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