CHM 121L QUIZ 3 - n CHM 12 Name Fall 20 l I Quiz#3...

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Unformatted text preview: n CHM 12”, Name: . Fall 20! l I Quiz #3 Potentially Useful in formation: Molar Masses (g/mol): AI = 27.0 KOH = 56.1 Hz = 2.0 ransom-121120 (alum) = 474.2 I. (12 pts) In last week’s experiment, Awino used 0.398 g of aluminum cut from a can to synthesize alum. Awino used a filter paper that weighed 0.437 g to collect the alum and dried it for 48 hrs. The weight of the filter paper and the alum afier drying was 5.777 g. The balanced equation has been provided for you below. Show your work. 2 A! (s) + 2 KOH (aq) + 4 H2804 (aq) + 22 H20 (I) ——2 2 KAI! 80412.12 H20 (5) + 3 H2 (g) i. What is the theoretical yield of alum in this experiment? ' l 0.3qg3fll M _ \ n\0\ Mum kn“ 1 Mn“ _ \ /\ *4" “ °' 31%? If 21') M \ mol N \ MDl Mum m ii. What was Awino’s percent alum yield? 5'7“ ’ o m; 2 5 3% Mom I v . *4 _ 5.5“! Aw ._ ‘ Allsto‘ilicm ‘60 ' f—J— “ ~, ‘00 _ [h ‘0 .‘mo 3w.» 2. (2 pts) In the previous lab and today’s lab we synthesized hydrated salts. Define the term, ‘hydrate’. \n\\&l0\t is *0 Mt \nomr lo 5M snlosmt if M3 \\L0 3. (3 pts) In today’s experiment, why do you have to label the filter paper with pencil and not with pen? llm mv hum M 9m V1105 mm W “k “ML film {x k U m I“ (,2 “0b *0 loan 50m ol » any Mr ‘X N\>% / 4. (2 pts) You are going to use acetone to rinse the solid BaSO4 in today’s experiment. What precaution(s) are given in your procedure about acetone? Q I . 1‘ / \LQ Q01 0N, (\mfij in)“ We“ (“‘1ng (\CJ qfifimxk LC [magma bu. 7 [lttlrmt M vii be dltpoftd .h worm, law- 5. (4 pts) What is the purpose of rinsing your 811804 with acetone in today's experiment? “‘4” with mf'L‘u's olx’ i.le mom and dues «u gong 5- (4 PIS) From your reading in the discussion section of today’s lab define briefly the meaning of the following terms. i. Efflorescent salt ii. Anhydrous salt 7. (3 pts) In today’s experiment you will be transferring solid BaSO4 from a beaker into a filter paper. You are cautioned not to use the rubber policeman. Why should you not use the rubber policeman? W “96“ 90Mme W“ com 1300 40 mi sum or 4'th S‘Jbi'if‘l‘U- \h #4, 1y pcr‘V-ULVA b3 “.52 <1» “5.1!. a," aw IU_II'I‘l-'./(' E07 JJLyAVAR“ 4L1, / ,r / , //7/ ...
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