Question

PRE-LAB for plt.titeation.ofa 5tremsAcid.wth Bast This is due before the lab begins 1. Calculate the pH of the following solutions (a) 1 M NaC Name (b) I M HOAc (Ka-1.8 x 10-5) (c) I M NH4OH (Kb- 1.8 x 10-5) (d) 0.1 M NaOAc (e) 0.1 M NHCI 2 The pH of a 0.100 M solution of an acid, HA, is 1.70. Calculate the K? (use ICE) 2.Show your work with units and correct significant figures for all questions that involve a calculation. 1.Predict the expected pH ( <7, >7, =7) at the endpoint(s) of each of the three titrations. Explain your reasoning a. Titration of a Strong Acid, HCl, with a Strong Base, NAOH Predicted pH (circle one): (a.) <7 (b.) 7 ( c.) >7 Circle your answer and explain below. b.Titration of a Weak Acid, KHP, with a Strong Base, NaOH Predicted pH (circle one): (a.) <7 (b.) 7 ( c.) >7 Circle your answer and explain below.

Answer 1

Not & cr doesn't salk - with So water a) Nail as neuhral undergo any hydrolysis So pn 27 b) HOAC weak HOAL I im nenize completely) acid (so no BAT that 0 0 neglect x ces Kacla kar (AC) Cut) Crotc) 180105 - ² ) & a CAT) a J 18x105 = o-oohm pra to Co-oon = 12:40 weak base Nhuonto ² what ton c) NHy on Kor CNHut) Cont) (Nhyor) 1.8x105 a x2 x 2 con 2 o.ooum P4 - - 0 - 1 - z) por 22-4 2) © | base & d) k OAE is from consugete la HOAL. calculate I-OX10 1.8 xlor 5-6* 1010 Ta 2 honctHO Kb 2 HOAC tou / CHOAC) Con COAC) ) COH) 2 ] 5-6x1000 o-om

Conde 2 x 156 m pon = 5.2 2) pH a 18-8 (14-5-2) e) oim why I t want is conjugate non weak base nnor, so acts as and. weet the whon tht of reglect x as Karlos z toxloty 1-8x60 25-6*10-10 2 Canon Cut) (Nhut) Cht) 2 x 2 J KG (NAT) Cut) = 7*150 m 2) pH (3-2) na 1.70 ) Caft) 2 1070 22-0 x 102 m. 2 change ax HAŽ Het the 0-100M 0 0 - 2.0810? +2:0x102 +2-okol 0-100 - (2.0x102) 2.0x102 20010 K2 (4+) Cad Сне) < (2-ox10272 c G Co-100 (2-0x102)) 0.0050 Sorry 2 5 .ox 103

a) in hitration of strong acad, nel and strong bao, may at end point, salt formed wat they is ) ci are neubral doesn't cons of salt undergo strong Nach any base so so neither hydrolysis as & strong and pH a pH d Pue water. = 7 6.) KAPT Noon 3 Khat p2 + H₂O Salt formed at end point. ithalate non (A-2) is conjugale base a weak acid Hp, so acts as base so por 7 (optione) 3.) at HCl +Noon end - NachtH₂O point, mores real a moles Noah 0-10mx 25.00mL l 0-02omx waon. unaon at end point a 100 mix 103 4 =10.1017 z 1-oxif me 4) maleic acid is diproric acid her is as H₂A. so it required 2 moles naon for each mole to get neutralized HLA + 2Naon Na A+ 2H2O moles 42A 2 + xmoles Noor z) o loom x 25.00m 2 x mraon x 22.10 me z) mnoon 2 0.226 m ca srg-figures) you have to draw plat by taking pH values on your and mL Noon on x-arts , the plot obtained could be nice this > eqwnch ente por om volume Noon