Question

for 2. A solution (75.0 mL) of 0.250 MNH, is being titrated with 0.500 MHCI. Ks- 1.8x10 NH). What species are present, and what are their concentrations: (a) Before any HCl has been added? (b) When 17.5 mL HCl have been added?

Answer 1

NO-O Answen 8 Griven tal NHis The Solution troatid birg -S Cin m) Holasity x volume M Moe f AH (8.7s mo PK Ca) Befora any tl has been edblad -C t CA ecm) c-cL CL Cf Кь L1-) NHS veryvery |.४४1०) kь C

FageNo- as Cон"] 2.123 PoH _ P 1-33 added (b) mmol af Hcl NHHu Total Volune 8.75 -8 +8.75 -85 92-5 ml Soltion hose Calulatio buffer -forns a РКь + 1 PoH tose 4.68 POH= pH- 4-POH l4- 4.6g m mol af H addad (C) NH3Hc Total 8.75 voluna 535 -18. (12-S ml

shith isfosned balt by wea K be CalCulatid by acid ond p an base (PKio-pkp-l0) 1g.nno 2.5m 황016구) Y 14-4u- pt -S.o S-o2 addad = O So x5 - 12-5 mrol (d) mmol of Hc Nt Total volume ఇa- 20 ml t18.75 -18. १5 -18:+5 C Elmnoi) 8 3.75 definad by be Noo pH i 3.75 mmo =2.1 ao mL