Cengage * YR CVLv2 I Online teching * 8 – nx CO west.cengagenowcom/irn/takeAssig

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Cengage * YR CVLv2 I Online teching * 8 – nx CO west.cengagenowcom/irn/takeAssignmenttakeCovalentActivitydo?locator-assignment-take&takeAssignmentSessionLocator-assignment-take; Q fo: Chapter 14: EOC References Question 36 1 pt CHEMWORK Calculate the pH of a solution containing 0.50 MHC HCHO, and 0.40 MS NaC2H03. The K, for HCH,0, is 1.8 10 > . Question 37 1 pt Queston 3B 1 pt pH - Question 39 1 pt Submit Hint: Question 40 1 pt Ouestion 41 1 pt Question 42 0 1 pt Submit Answer Try Another version 10 item attempts remaining Question 43 1 pt Question 44 1 pt Question 451 1 pt visited Question 46 0 1 pt Question 47 0 1 pt Question 48 1 pt Question 49 1 pt Question 60 1 pt Question 51 1 pt Progress 22/61 items Due Nov 1 at 11:55 PM Previous Next Hinish Assignment Prmail Instructor Save and Fxit 8:20 PM Type here to search AE 11/1/2011

Explanation / Answer

Ka = 1.8*10^-5

pKa = - log (Ka)

= - log(1.8*10^-5)

= 4.7447

we have below equation to be used:

This is Henderson–Hasselbalch equation

pH = pKa + log {[conjugate base]/[acid]}

pH = pKa + log {[NaC2H3O2]/[HC2H3O2]}

= 4.7447+ log {0.40/0.50}

= 4.65

Answer: 4.65

Feel free to comment below if you have any doubts or if this answer do not work

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