Question

Which is true for the following titrations.

Question 3 options:

123 The titration of a strong base using a strong acid. 123 The titration of a weak base using a strong acid. 123 The titration of a weak acid using a strong base.

1. The pH at the equivalence point is approximately equal to 7.0. 2. The pH at the equivalence point is less than 7.0 3. The pH at the equivalence point is greater than 7.0.

Question 4 (1 point)

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Which of the following could you add to 1.0 mole of hydrofluoric acid to make a buffer?
Please make sure to mark all correct answers.

Question 4 options:

	1.0 mole of HF(aq)
	0.5 moles of HF(aq)
	1.0 mole of NaF(aq)
	0.5 moles of NaF (aq)
	1.0 mole of NaOH(aq)
	0.5 moles of NaOH(aq)
	1.0 mole of HCl(aq)
	0.5 moles of HCl(aq)
	you can not make a buffer using hydrofluoric acid

Answer 1

Solution The titration of strong base using a strong acia The pH at the equivalence point is approximately equal to 1 true The pH at the equivalence point less than 7 true The titration of weak base using a strong acid The titration of weak acid using a strong base The pH at the equivalenc point is greater than 7 trul 9 If we add 1.0 mol Na Fag) in l.o meel of HF Chydrofluoricacid) buffer will form If we add 0.5 mal NaOH(aq) in 10 ml of HF buffer will form. + H₂O NaF Na OH 0.5 +HE 1.0 to.5 -0.5 -0.5 0.5 As we know, pH = pka + log CF HF HF can't make buffer with HF and can't make buffer with Hee Ans'- lo mieles of Naf all) 0.5 males of NaOH (ar)