Based on the data below Why is the ph of the solution of 1 (in water) different

Question

Based on the data below Why is the ph of the solution of 1 (in water) different than the other ph values in 2 and 3.
1)The ph of pure water=4.56 Ph after adding NaOH=10.01 Ph after adding HCl=2.89
2)Ph buffer prepared by adding equal amounts of acid and basic component=9.16 Ph of (2) but diluted buffer (half)=9.00 Ph after adding NaOH=9.06 Ph (2) but diluted buffer (2nd half)=9.02 Ph after addding HCl=9.04 3)Ph buffer prepared with acid and more basic component=10.01 Ph after adding NaOH=10.01 Ph after adding HCl=10.01
Based on the data below Why is the ph of the solution of 1 (in water) different than the other ph values in 2 and 3.
1)The ph of pure water=4.56 Ph after adding NaOH=10.01 Ph after adding HCl=2.89
2)Ph buffer prepared by adding equal amounts of acid and basic component=9.16 Ph of (2) but diluted buffer (half)=9.00 Ph after adding NaOH=9.06 Ph (2) but diluted buffer (2nd half)=9.02 Ph after addding HCl=9.04 3)Ph buffer prepared with acid and more basic component=10.01 Ph after adding NaOH=10.01 Ph after adding HCl=10.01
Based on the data below Why is the ph of the solution of 1 (in water) different than the other ph values in 2 and 3.
1)The ph of pure water=4.56 Ph after adding NaOH=10.01 Ph after adding HCl=2.89
2)Ph buffer prepared by adding equal amounts of acid and basic component=9.16 Ph of (2) but diluted buffer (half)=9.00 Ph after adding NaOH=9.06 Ph (2) but diluted buffer (2nd half)=9.02 Ph after addding HCl=9.04 3)Ph buffer prepared with acid and more basic component=10.01 Ph after adding NaOH=10.01 Ph after adding HCl=10.01

Explanation / Answer

The solution 1 is acidic and hence its pH is less than 7.

The solution 2 is a basic buffer and pH is greater than 7.

The solution 3 is also basic but basic component is more in amount than acid component. For the reason, pH is even more than the pH of solution 3.

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