Question

please help!! calculate pH of solutions on second page a-c!!

1. (4 points) A buffer solution is created with C;H,NH, and 0.012 M C;HsNH2. The K, for C,H,NH2 is 4.7 х 104. What is the concentration of C,HNH, in the buffer solution that has a pH of 11.50? а. What is the concentration of the buffer solution if 0.0011 M HC is added to the buffer in part a.? b. Why is the buffer a basic solution? Could this weak acid/base pair create an acidic buffer solution? c. (4 points) For each of the following solutions, determine if a buffer is formed. Why or why not? 2. 1.0 M HCN and 0.20 NaCN a. 0.08 anxi ufoe o o H o swlld nou al n b. 0.10 M NH.Cl and 0.90 M NH&Br c. 0.10 M NaCl and 0.20 M HF d. 0.50 M KOH and 0.50 M HCOOH MSLO

Answer 1

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mmol of NH Molari Volume a. S.o x 2 25: 18mmol 20 o85; mmt HBr NH3 HBr NHy B Tetal ve lume = 28 mt I(mmo) JEforms a buffer coluHam c (mma) -13 -13 +12 PH coleae L E (mmov pal pkb base -pk - 4.36 4.36 + poH LV29 pH=14-pok m me F HCi- lo Smmor mmo of Naou Io S MMol Nac нос HOC Naoc HCI (me) o-5 o5 C -D-5 -lo-5 o.S E (mmol) o.S HOc lo.5 mmo O-335 M 23 m ka C as ka is vey len - Hoci T(M) 3.x10 3.06KlD ka C (M) C +Cx O 33S E Cm) C- 1-14x10M pH 3.g4 mmoi of HIO= 4ox o o4 2 0-S6 mmo here both KoH S KIo Care present, * kor mairly dfinedy-pH. C. m o of koH 30x o 020 O.G Mmo KTOH20 )=.04mm0/5.7K koH HTO o.6o O.S6 D.5 -o.S6 C(mmol) -o-St PoHE 3.29 O 56 with | Pদ = 14-70M=|1०*76/ CamScanner