March 13, 2018 101325 x 1o* Pa; deg K-deg Multiple Cholee tpich 1 Consider the b
ID: 1032941 • Letter: M
Question
March 13, 2018 101325 x 1o* Pa; deg K-deg Multiple Cholee tpich 1 Consider the best answer Which would have he highest pH? 10 g 3. Which solubion has the highest pH? AI 20 MHF.10M NaF D) 0.6 M HF, 0.5 M NaiF ?) 0. 5 M HF. 1.0MNaF B) 1.0 M HF, 3.0 MNaF af the agrvalree port when 25 00mio, o 10 M HA (K-2 2x 10') isstrated win?1O M NaOH E) 4.32 8) 9.83 strated with a C) 4.17 D) 9.68 astrong base a bulfer will be formed A) berore the eq pt 3) after the eq pt C) at the eq pt 6. What A) 9.31 s the pH of a solution made by mixing 30 mL of o 20 M NaOH with 25 ml of o.20 M HCN (KHN E) 11.15 B) 12.52 C)148 D) 12.70 HA42 x 10 s trated with 0.10 M NGOH haeuinalence point pt when 25 00 8. What is the cormect Kap expression for Pbs(POaa1? 7 What is the A) 8.38 D) 4.84 B) 5 82 C) 4.69 9. Consider saturated solutions of the following compounds. Which solution has the lowest concentration of F- ion? b Cafa K-3.9 10-11a. MgF: Kap -3.7x 10 10. For Fe(OH), Kap. ? C. 27st e.9s 11. In which af the following solutions would the solubility of calcium carbonate be the smallest? b. 2.0 M sodium chloride a pure water d. 0.2 M sodium carbonate e. 0.2 M HcI c. 0.1 M calcium chloride 12 What molar concentration of Po is required in a 4.0 M NaBr solution to observe initial precipitation of PtoBr(K 467 x 104)? b. 1.1 x 10*M c. 5.8 x 10-7 M d. 1.2 x 10 M e 2.9 x 107 M 13 What concentration of Po? is required in a 4.0 M NaBr solution to observe complete precipitation of PbBra (Kp 4.67 x 10)? a 6.8 x 10 M b.1, 1 x 1?-M c, 1.2 x 10-3 M d. 2.9 x 10'M e. 2.9 x 107 MExplanation / Answer
1ans:- option (d) i.e NaF
Explanation:- because NaF is a salt of strong base i.e NaOH and weak acid i.e HF , therefore pH will be more.
Similarly NH4NO3 is a salt of weak base(NH4OH) and strong acid(HNO3) , therefore pH of solution will be lower.
NaNO3 is a salt of strong base and strong acid, thereforle pH should be close to neutral value i.e 7.
NH4F is a salt of weak base ( NH4OH) and weak acid (HF) , therefore pH value not too large or not too small.
H2CO3 i.e carbonic acid is a weak acid ,
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