Question

Question 15 (2 points) A basic buffer is prepared by adding 0.4870 g of NH4Cl to 1.00 L of 0.2799 M. NH3. Kb (NH3) = 1.8 x 10-5. Calculate the pH of the buffer. Provide your answer to two places after the decimal. Your Answer: Answer Hide hint for Question 15 You must convert the mass of ammonium chloride into molarity. Also, you need to calculate the K, of ammonium ion from the Ky value of ammonia.

Answer 1

mass of NH₃ cl is 0,4870 g is 53.5 g/mol morar mass of why a more of NMy cl in 0.4870 m Moly 53.5 = 0.00 g 10 mors [NHGC1] = 0.00910 mores = 0,00910 M As k = 1.8x105 Kw = 10x1014 3 ką - 5.51 x 10 1.8 x 105 9.26 cs Scanned with a 2-log (=5 x1070) = CamScanner

Aslo, Ento] = 0.2799 M pH = pka + log Enth - 9.26 + log (6.2799 ) = 10.7479 0.08910 MANUELINE cs Scanned with the pH in, pha 10.7 Aug CamScanner

Hope it helps...pls do upvote