A buffer cannot be prepared by mixing a NH_3NH_4 solution b. HCOOHNaCOOH solutio
ID: 510165 • Letter: A
Question
A buffer cannot be prepared by mixing a NH_3NH_4 solution b. HCOOHNaCOOH solution c. HF reacted with HCI d HF reacted partially with NaOH e. all responses above are correct. Which of the following anions would be the strongest base? a. CH_3CO_2^-(CH_3CO_2H:K_a = 1.8 times 10^5 b. KOH c. NH_3(k_c=1.8 times 10^5 d. HBr e All are equally basic In which of the following situations would the weak acid have the largest percent ionization? a. 0.50M formic acid, k_a = 1.8 times 10^4 b. 0.1 M formic acid, K_a = 1.8 times 10^-5 c.0.1 M acetic acid, K_a = 1.8 times 10^-5 d. 0.01 M formic acid (K_a = 1.8 times 10^5) ples 0.15 M sodium formate e. none of the above Which of the following salts is neutral? A. NaF b. NH_2Cl c. CaF_2 d. CaCO_3 e. none of the above Which of the following salts is least soluble in otherwise pure water? a. AgCI, k_ = 1.8 times 10^10 b. AgCl, K_ = 2.0 times 10^13 c. Agl, K_ = 8.3 times 10^17 d. AgBr, K_ = 5.0 times 10^-13 e. CaBr, K_ = 5.3 times 10^9 Calculate the Ph of a solution prepared by missing 10.00 mL of 1.0 M HCI(aq) with 9.00 mL of 1.0 M N_2OH. a.12.72 b. 1.28 c. 0.00 d. 1.00 e none of the aboveExplanation / Answer
6) Answer : c) HF reacted with HCl
HF and HCl both are acids so buffer can't be prepared by mixing two acids.
7) Strongest Base is KOH
Answer : b) KOH
OH- ion is the strongest base.
9) NaF is base. (F-)
NH4Cl is acid (NH4+)
CaF2 is base (F-)
CaCO3 is base . (CO3^2-)
There is no neutral salt
answer : e) none of the above.
12) Concentration of H^+ ion in mixture = (10.0mL*1.0M-9.0mL*1.0M)/(10.0mL+9.0mL)
= 0.0526 M
pH = -log(H^+)
= -log(0.0526M)
= 1.28
answer : b) 1.28
Note: values in remaining questions are not visible.
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