Chemis*y 12 Worlcsheet 410 -pH and pOH Calculations

Chemistry 12Worksheet 4-5

1. Find the pH of the following solutions. Make sure you express your answer inthe correct 1numberofsignificantdigits.(l2marks) pt\ -- \oS f lls6a , pbq-_-\oqiOfF_

a) 0.0010 M HClo+ ..... 3. OO b) 2.3s x t0'3 M KoH ... \ \. 3+\ "L

c) +.678x 10-5 M In'lot..q-b2qq d) 12.0 M HCI ......:........... - \ - O-] qe) 0.20 M Ba(oH)z . .$1[Q- D 4.30 M H3o+.................:-0:-bE 3f oF\a "- 0,+o H '

2. Find the [H3O*] in 0.00256 M HBr. (1 mark)

!1 Br t t{:-o + !tro- + Br3. Find the tH:o*] in 0.80 M LioH. (2 marks)

Li ot\ + L. -t + 0*--L* 3o*] = K*\/Co trr1

4. Find the [H3O*] in a solution with a pH: 3i2l6r(1 mark)

_rl"Answer [.. O? xtO t F4

t

o, qo Ft

Answer ft\nl=-Ko = [" \fatt-\(yrrJ

r cLo+

Answer b+ xIor-tt F4

t#sct= (tn+, t'.3 GPr{)5. Find the [HrOl in 0.45 M BaO (2 marks) , a

BAO-- Bft&* -t 0 e- '!lr$1 =

oe- * Huo * noi?$sH '

6. Find the [OH-] in 0.150 M HCIO+ (2 marks)

FtCto rq * tApo + F{sct6E)o' !5e b& o'\5ct4

.!-,t.^, t,LDF| J = _f-.,,^r-

[h\uil!

I r+30t1=Answer \.3t ,.fO

o. s?Sb F4

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H and oOH Calculations

Name

Chemistry I 2 -Wortrs he et 4 t -pH and pA H Calcalations Page I of2 Pages

Chenis*y 12 Wor lrs he e t 4, 4-pH and p O H C al cal ati o ns

7. Find the [OH'] in a solution with a pH : 8.940 (2 marks)

a P0\-\ :,\+- B.qr{o =- 5.06O AnswerS.lfina tfre tOFrj in &tution with a pOH: 2.156 (1 mark)

qN aoH ?po*Y \\-\ So - ).So )

9. Find the [O]fl in 0.87 M HNO3. (2 marks)

[*3ot]= o.rt b\fortt =- \(* /r*sof Auswer

10. Find the [H3O*] in a solution in which the pOHL 4.50. (zmarks)

fottl= 3-\b?-3 xto-sf-ttfo! i K*/eo$a Answer

I 1 . Solution A has a pH of 3.0 while soldtion B has a pH of 7.0.

a) Which solution is more acidic? (l mark) A jk- S . C- - +.^D D,,W

b) The tH3O.l in solution e is \ @0O ,times as high as it is in solution B (1 mark). 0 O t)ev{g pI\ \<.ile \ : to x dn,ang< in f !tso+]

12. How much water should be added to 500.0 mL of a solution of HCI with a pH of 2.00 to

^bringthepH to2.S1.showallyourwork. (3 marks) l{r=p.otoo)(5m,o)

pF\ = 9. 5D +*f HEq:t_: 3 \ bLZ x ro-3 H : 1) 59 \ $,+L

(,1!1 = L*J- l.\x\U qrU --_@_Gtiml--t)13. What mass of NaOH should be added to 300.0 mL of water in order to prepare a solution \ . o? t * u

withapH: 11.50. Show all your work. (4 marks)

*{8"1\ ntt'M'

tlt5t

fo *1 : 3. \bzb xto-3 t-{ ,

-rd\,\ x\o 't q

3- )* x ro-to {

0.036 Na o*x A,\IAOE x

\pd \ $ rrot.__

(** Na o el s2

{t{aoH = 3,\bAl* ro-3 d\F-

6- tr^--)

,g Chemistry l2-Worksheet 4-$-pH andpOH Calculations Page 2 of2 Pages