31. Which of the following pairs of solutions could be mixed to produce a bu ffe

Question

31. Which of the following pairs of solutions could be mixed to produce a bu ffer? a. HF and NaF, and NH, and NH,CI only b. NaOH and HCl only c. HF and NaF only d. NH, and NH,CI only e. NaOH and HCI, and HF and NaF only 32. Which of the following mixtures will be a buffer when dissolved in a liter of water? a. 0.2 mol H,PO and 0.1 mol NaOH b. 0.1 mol Ca(OH), and 0.3 mol H c. 0.3 mol NaCI and 0.3 mol HC d. 0.4 mol NH, and 0.4 mol HCI e. 0.2 mol HBr and 0.1 mol NaOH 33. Which of the following is the most effective buffer system for a ph value of 7.457 a. H,PO/HPO,2 K 6.3 x10

Explanation / Answer

Buffer is a mixture of weak acid and its salt or weak base and its salt.

35) Answer option a) HF and NaF and NH3 and NH4Cl

HF is weak acid and NaF is its salt, NH3 is weak base and NH4Cl is its salt

36) Answer option a) 0.2 mol H3PO4 and 0.1 mol NaOH

after mixing 0.1 mol NaH2PO4 + 0.1 mol H3PO4 will be present.

H3PO4 is weak acid and NaH2PO4 is its salt.

0.1 M Ca(OH)2 + 0.3 HI => 0.1 CaI2 + 0.1 HI + 0.2 H2O (HI is strong acid)

0.3 NaCl + 0.3 HCl => 0.3 NaCl + 0.3 HCl ( HCl is strong acid)

0.4 NH3 + 0.4 HCl => 0.4 NH4Cl ( only salt presents )

0.2 HBr + 0.1 NaOH => 0.1 NaBr + 0.1 HBr ( HBr is strong acid)

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