Question

The Relative Strengths of Some Acids Results Solution pH from pH Paper pH from Indicators pH from pH Meter 2.8 14 1.99 1.4 1.4. HCL Ha POq HC2H30a Na HQ PO & AL (NO3)3 Zn(NO3)2 NH 4 NO3 1.7 1.7 4.63 2.4. 2.8 5.00 6.67 Questions 1. a. Calculate the concentration of H.O ions in the most acidic solution that you examined. Use your most precise pH measurement,

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Answer 1

Ans i a) Coneutration et mour acidie solution - From the given pH values the most acidic solution welll be HG 4o. o pH = -log [ht pH le equal to negative log of concentration hydeonicem com pH = 1.40 (given) 1.40 = -log [ht? [Mt7 a - antilog 1.40 [ht] = 0.039 M! b) concentration of last acidio solution - freom the given pH values the least acidic senteon celll be the one curth highest pH valve d.e. NHq NO with pH 6061 . pH = -log[ht ] [H] = - centilog pH. [ut] = - antilog 6.67 [ht] - 2.13 X10-71

2a) Quemasing eredus f adidity HAHOy) Hel) AINO > HP037 Nal, Po) 2010) I NG NOZ HG HO is highly acê die where as NHA NO is least acidie on the basis of pr values in Table 3. b. in Table 1 we cannot precisely differentiate between mest aidie and least acualc, as not all acidies have specific pH value it is similar to some other acidie in the table where as in Table 3 we can differentiate ! between mest and least aciale because of the precise callles. • in Table 1 pH of HPO4 in 2.8 I and that of a HBO is 167 This shoues Nase Dog is more acidie that HROA which is not toue. H₂PO4 + 4 + thoa ki kg HPO H+ + Por - kk 7tz.

Page NA Dar chere as in Table 3 HPO - +99 - H. por 1.96 cechich is precise and right. It shones correctly that H₂PO4 is more acidic than NdH, PO4 H₂PO4 is more acidic than Nath, Poq or 4 Pou because HPO4 is a neutral molecule hence tendency to lose cloot pecoton is easy wewee as in H₂PO4 is a negatively charged molecule uerich. somecenat hinders the loss of peaton. Hence we can say that H₂PO4 is more acidie than 4 Dou. Но, а н* + ҷрса , H₂PO4 4T + HPOP- Hoor- Ž 4+ + PO قالوا (E