200 300 40.0 50.0 ml. titrant labeled (7) The pH of NaHCOs is 9. What is the (OH

Question

200 300 40.0 50.0 ml. titrant labeled (7) The pH of NaHCOs is 9. What is the (OH- the concentration ? iven he side (8) Of the following ions (I, K*, PO3,CO3 2) which will hydrolyze ? (a) only l (b ) both I-and PO3 (c) only PO43 (d) both PO4 3 and CO32 (9) Which is false? (a) a buffer consists of a weak acid and its salt (b ) a buffer consists of a strong acid and its salt (c ) a buffer consists of a weak base and its salt ith oint (10) What is the pH of the solution obtained by mixing 60.00ml of 0.250M HCI and 60.00ml of 0.125M NaOH? NaOH + HCl NaCl + H2O strong e will (11) What is the pH of the solution obtained when 60.00 ml of 0.25 M HCI and 90.00 ml of 0.25 M NaOH are mixed? The equation is the same as in # 10.

Explanation / Answer

7)

we have below equation to be used:

pH = -log [H+]

9 = -log [H+]

log [H+] = -9

[H+] = 10^(-9)

[H+] = 1*10^-9 M

we have below equation to be used:

[OH-] = Kw/[H+]

Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC

[OH-] = (1.0*10^-14)/[H+]

[OH-] = (1.0*10^-14)/(1*10^-9)

[OH-] = 1*10^-5 M

Answer: 1.0*10^-5 M

Feel free to comment below if you have any doubts or if this answer do not work

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