Question

How many millilitres of water is added to change 100mL, pH=2 solution into pH= 2.6 solution
answer with explanation please

Answer 1

Answer:

60ml

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Answer 2

Given: 100 mL water has pH= 2

To find: Amount of water that has to be added to make the pH= 2.6

Explanation: pH of water increases on adding water because it dilutes the concentration of acid thus decreasing the acidic character.

The formula relating pH change to volume is given below:

Change in pH= log (V2/V1) where V1 is volume before addition and V2 is volume after adding water.

V1= 100mL

Using formula, 2.6-2= log(V2/100)

=> 0.6 = log (V2/100)

=> log 4 = log (V2/100)

=> V2 = 4*100

=> V2 = 400 mL

Water added = 400-100 mL= 300 mL

Therefore, 300 mL water is needed to be added to make pH= 2.6