Tests For Carbohydrates Lab

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Mt San Jacinto Community College District *

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107

Subject

Chemistry

Date

May 1, 2024

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pdf

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4

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REPORT SHEET Tests for Carbohydrates Test Water | Glucose| Fructose| Lactose| Sucrose| Starch |Unknown ' B A. Benedict’s Test for Reducing Sugars 1. Observations [UX\yy, ()YN\%Q_ va\%x '“B\M, Bl OML ; 2. Reducing/ Now . oo Mo [Nen, ' Nomdlming &“‘“‘%%UV%MN“ : ‘%‘AJLU“Q' %A“(HQJ W"fi B. Seliwanoff’s Test for Ketoses =~ : ?onllci);s T 0 ey Qooy [Pl Pad [Ueaw | Clear 2. Ketose/Aldose MMdose [“Pldsse HKedose “‘Vfi_\o% Pidose, [Hildese C. Fermentation Test 3. et : Lo [Lots of Lels of Lots of b Mg / Rubies] Babblea] O Db . bble 2. Fermentation (Yes/No) / Yo 150 Yes %s D. Iodine Test for Polysaccharides - Ne [Ne [Ne N [WDeap [N L \ 0 4 i Ha (hokag C\«uwjn, CJNW% e s Hlug Q\v\u\%g 2. Amylose : ' : (Yes);l\(l)o) No ' LN Ne Ne \f}! s | W Questions and Problems Q1 From the results in Part A, list the carbohydrates that are reducing sugars. Wuhiw\g\) TUgavs ave os\iu»o‘amfiwc\o‘uf., and, Lackest .
Tests for Carbohydrates Q2 From the results in Part B, which carbohydrates are ketoses? Thw c;u\m\m\&mhs Avak oxe Valoses ave, {vudose ondy suarese Q3 . From the results in Part C, which carbohydrates give a positive fermentation test? The co\\m\uxc\\e\as Yrod %\me\\ofi\\\\l% Lot nkoliovu dast axg, cx\u(os.sz L vuches €y suavese ) andl unlvown B, Q4 From the results in Part D, which carbohydrates give a blue-black color in the iodine test? T Lt\‘cO\»\ac\\do,s Aod o o \o\\u, olavky: toloy o AL e Yast 16 Stoxch, » Identifying an Unknown Carbohydrate Unknown No. \& Results with Unknown Carbohydrates Present ey Qmmu ‘*fl\u\\m\\u (g\uuSL Frachs \\Au cdese Scmanolts 0) Qum( | B\ Aese Cruckecr qod Suovess, = Lots ot bubbles | Pesilvy , Fermentation (C) |~7> ¢/ P00y Y CZ\\“‘ 080 ‘q\:( uednse, Duset | - haha & Y Iodine (D) &NG(\\C\:\U‘\\(, "NQ%&L WwWo ow &N(\ C)\A\l\fib What carbohydrate(s) is/are in your unknown? Cé\ WS Questions and Problems Q5 What carbohydrate(s) would give the following test results? a. Produces a reddish-orange solid with Benedict’s reagent and a red color with Seliwanoff’s reagent in 1 minute CK' Y\)\L\ L b. Produces a color change with Benedict’s reagent, a light orange color with Seliwanoff’s reagent afier 5 min, and produces no bubbles during fermentation [Lac) ot
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