15% 88% CH4 H Tue 12:31 PM Q = chemresources.chemistry.dal.ca 13.34 1277 Safari

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15% 88% CH4 H Tue 12:31 PM Q = chemresources.chemistry.dal.ca 13.34 1277 Safari File Edit View History Bookmarks Window Help capa.conceptsinchemistry.com LON-CAPA GA9 Question 5 Chegg Study Guided Solution. Determine The PH (to Two D. + E Main Menu Navigate Contents Courses Help Exit 4 Go to the previous Go to the next Tresource in the resource in the course sequence course sequence @ Show catalog information O Provide my evaluation Provide feedback messages or E Prepare a printable contribute to the course discussion of this resource document about this resource Make notes and # Set a bookmark for Pannotations about P this resource this resource CHEM 1021 - Mount Allison University - Winter 2018, Graded Assignment 9: GA9 Question 5 A buffer solution is prepared by mixing 49.8 mL of 0.0311 M sodium dihydrogen phosphate with 26.5 mL of 0.0598 M sodium hydrogen phosphate. 12.08 Table 10.2 pk, and pH values at 25°C for some common sok adidas and their compte bus Addre As formula F,CcOOH 020 Ecco0 Lichloroacetic acid ?????? 0.06 Cicco0º Hoocco0H 120H0occo0 CHCOOH sulfuros acid H,SO, PHOSOO 1 HSO: hydrocesulfate in HS0; 12 so: chlorous acid ??? phosphoric acid MPO, 212 H,PO; chloroacetic acid ???????? 2.87 CM,CC00" tromatic acid Beth,cco0H 2 00 Brn,cco0 Lartistid CHOCOOH 308 C,H,Oc00" citric acid ???, ?????), 3.13 CHOICOOH),co0 hydrofluoric acid nitrousse HNO, 3.37 NO, ??? ? C,H,O,coOH 3.48 C,H,O,co0 formic acid ????? 175 HC00 aortic acid ???,???? 4.10C,H,O,co0 HOOK.CO0 4,19 -00cc00- beroic Acid ???? 420HC00" phenylammonium ion CH, NH; 4.63 GH, NH, ???? ? vidiorecta io hydrogenoalute in didiorectate in hydrogen sulle on sulfate on done on dihydrogen pupute is chloroacetate in tromacetate in tartate in dihydrogen citrate is 118 11.13 11 10 10.80 10.63 10.52 900 A table of pKa values can be found here. acetylsalicylation formation acorbate in alate in berrate icon phonylamine (aniline) ??? ?? in net ? 981 9.37 1. Calculate the pH (to two decimal places) of this solution. Assume the 5% approximation is valid and that the volumes are additive. 1 pka 9.25 Tahle 102 continued Acidume acetic acid dihydrogen crate lion butanoikaid propanese scie pyrnuman carbonic acid betrogen crate on hydrogen sulfite icon Ghydrogen phosphate ion Submit Answer Tries 0/5 Acid formula ??, ??? C,H,O[cooH),co0 ????? CHCOOH GHNH HOCOOH CH,O[coOH (co0") HS0; pH05001 H, PO ??? ???. ??????? ? ???? Conjugate ba name 4.SCH,co0 acetate in 4.77 C,H,O(coOHXco0*), hydrogen citrate in 42 GH,co0 4.87 CH,co0 S5 GHAN 637 Hoco0 hydrog carbonate on .40C,H,O(co0 % Citrate in 719 so- 7.20HPO- hydrogen phosphate on 153ca0- hypochite on 7.63 681 2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 3.24 g of sodium hydrogen phosphate (NazHPO4) to the buffer solution above. 647 phoclate in carbonate on SSS Assume 5% approximation is valid and that the volume of solution does not change. hydrogen carbonate lion dichey b enim in HON ????? Hoco0 (CHI, NH; ?????, CA NH (OH), NK CAN (CH), NH" 931 CN 10.00GH0 102sco; 100 c,R), 10 H, NH, 10.71C,H, NH, 107 (CH) 1087 H, NH, 11onecHIN 1238 Po; Submit Answer Tries 0/5 ethylammonium in triethylammonium ion ethylamine triylamine BAAS 2 MSend Message

Explanation / Answer

(1)

Using Henderson Hasselbach equation:

pH = pKa + log(moles of Na2HPO4/moles of NaH2PO4)

pH = 7.2 + log((0.0598*26.5)/(49.8*0.0311)) = 7.2

(2)

Moles of Na2HPO4 added = Mass/MW = 3.24/141.96 = 0.0228

Using Henderson Hasselbach equation:

pH = pKa + log(moles of NaH2PO4/moles of Na2HPO4)

pH = 7.2 + log((0.0598*0.0265 + 0.0228)/(0.0498*0.0311)) = 8.39

Hope this helps !

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