pH of a solution produced when an aqueous solution ofpH 6 is mixed wit

1.	pH of a solution produced when an aqueous solution ofpH 6 is mixed with an equal volumeof an aqueous solution of pH 3 is about:2) 4.31) 3.33) 44) 4.5
Answer» pH = 6 -log [H+] = 6 [H+]1=10-6 pH = 3 -log [H+] =3 [H+]2=10-3 [H+]mix=[H+]1V1+[H+]2V2/V1+V2 V1=V2=V [H+]mix= (10-6+10-3)V/2V = (10-6+10-3)/2 10-6being small neglected = 0.5 x10-3 [H+]mix= 5 x 10-4 pHmix= – log[H+]mix = 4 – log5 = 4 – 0.7 pHmix= 3.3

pH of a solution produced when an aqueous solution ofpH 6 is mixed with an equal volumeof an aqueous solution of pH 3 is about:2) 4.31) 3.33) 44) 4.5

Answer»

pH = 6

-log [H+] = 6

[H+]1=10-6

pH = 3

-log [H+] =3

[H+]2=10-3

[H+]mix=[H+]1V1+[H+]2V2/V1+V2

V1=V2=V

[H+]mix= (10-6+10-3)V/2V

= (10-6+10-3)/2

10-6being small neglected

= 0.5 x10-3

[H+]mix= 5 x 10-4

pHmix= – log[H+]mix

= 4 – log5

= 4 – 0.7 pHmix= 3.3