Chem Test Ch.8 pg. 2 - CHEM 202/202H Dr Cummings Name Exam...

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Unformatted text preview: CHEM 202/202H Dr. Cummings Name Exam l: February 22, 2008 9. During an episode of “Good Eats” (Food Network),Alton Brown stated that pH is a measure of the amount of “positively charged hydrogen atoms” and “negatively charged hydrogen atoms” in solution. He followed this up by saying that there are an abundance of “negatively charged hydrogen atoms” at high'pH and that there are an abundance of “positively charged hydrogen atoms” at low pH. Use correct terminology to expiain what Mr. Brown should have said and explain why referring to “hydrogen atoms” is inappropriate in this discussion. (10 points) W?“ ”40.3 {All} ll: is; at magma»: 053m”\?“03 (,0 victzxfisrzrth‘ori) Viol: "rwli/yciruggem Wibm C .P A” in) Low PM {will '> ELOt‘l'";l High 3:)“ Corl'j 7” {Eli} Section III: Work-out. Provide your answer in a clear and organized manner. Show all steps required to reach the answer for full credit, 10. Fonnic acid, HCOOH, is a weak acid responsible for the burn of ant stings. O )L i H 0-H (aq) m H+(aq) + H 0 (aql You measure the pH of a 0.024 M aqueous formic acid solution to be 2.70. What is Ka of formic acid in water? (10 points) thtié. eiozewx >1 x " . .w li #2470 . x L . .2 » .y— , ii) , . ’2 Mum-unu- >4 “’ QH “r” ‘0 f: ‘9 K64, OI CL’ZAE’WX :3 Mg 6 Lewis: ‘ 1m _ y 9 . TL MNMMNMM WWW-imwww‘ a. a. o > W w \’£\" Lflfii )Wt; lag yam Li/lq CO: 01%” .2 WW“) WW Page 4 of 7 ...
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