Pre Laboratory Assignment Fractional Crystallization

Grading: 60 ptsA.Starting Components (Fract. Crystallization #0)2 ptsStep 3: Mixture before first crystallization mass KNO3 4.501 gmass (NH4)2Fe(SO4)2.6H2O0.503 gTotal mass of the sample mixture5.004 g% Impurity (% Fe compound in the mixture)10.05 % (This is your % impurity for Frac Crystallization # 0)Fract. Crystallization #1Step 7: mass dry filter paper0.331 gStep 10: mass KNO3crystals + filter paper3.536 gmass KNO3crystallized 3.205 g% KNO3recovered (% of amt in Step A.3.)64.25 % Step 11: mass KNO3to be analyzed for purity (~0.1 g)0.103 gB. Fract. Crystallization # 2 (Re-crystallization)Step 6: mass dry filter paper 0.33 gStep 8: mass KNO3crystals + filter paper1.883 gmass KNO3crystallized 1.553 g% KNO3recovered (% of amt in Step A.3.) 82.47 %Step 9: mass KNO3to be analyzed for purity (~0.4 g)0.419 gEXPERIMENT 4:I. Fractional Crystallization of KNO3with (NH4)2Fe(SO4)2.6H2O ImpurityII. The Solubility Curve of KNO3DATA, CALCULATIONS AND GRAPHSPart I: Fractional Crystallization of KNO3with (NH4)2Fe(SO4)2.6H2O ImpurityPURPOSE AND METHODPart I (5 pts)During an experiment, the products that you are observing may be expected to be part of the mixture. Therefore, separation is an important part of experiments in chemistry. The purpose of this part of the lab is to use the crystallization and recrystallization as a purification technique to isolate a product from the mixture. Since the difference of solubility can be a function of the change in temperature, the purification process can be tested. Heat 100ml of water to 70-80 degree Celsius. Mix 5ml of water with 5.0g of mixture containing 10 part of Potassium Nitrate to 1 part of (NH4)2Fe(SO4)2*6H2O. Cool the solution to 0 degree Celsius. Remove all the solid crystals and dry it carefully. Measure the return KNO3. Take about 0.1g of KNO3 to analyze the amount of impurity, which in this case is Iron. Take the rest of the KNO3 and repeat the process again one

Unformatted text preview: Experiment 3 Data Sheet: Resolution of Pure Substances: Fractional Crystallization Show any calculations in the margins or on the back of this data sheet. 1. Mass of Original Sample Mixture ' Unknown # — i R / / \ Mass of 150 mL beaker , r g I 3 g g ’” b . t\ / /7 Mass of beaker and unknown H Q 22 g g Jx’" / Mass of sample ,2 3: Q1 g j " ‘ II. Separation and Determination of Sand in Unknown Sample r Massofsand Z {Z ~ I 6 7 o %sandin sample x/% 4 y IUOA .ZVS’OI III. Initial Se aration and Cr stallization of KNO3 im ure / 4. * / A. Mass of KNO; recovered impure KN 03 Total mass of KNO3 recovered fl {6 g /. g \ M, /l_ t - -‘ /‘ r‘ ‘ 4 % KNO3 in sample wwo'z) g {5' 6‘2 : I): ‘% 1 ( ’I x 0/0 A W 41/) I/z B. Analysis of KNO; purity — determining % CUS‘tj/fl. 5 H_20 impurity present / 4 / impure KNO_3 recrystalth KNO; _ [i L_ Mass of KNO3 crystals used for analysis ‘ 0. § /,g ‘ {i/ g % Copper sulfate in KN03 O, O 2 % z % IV. Recrystallization of impure KNO3 crystals A. Volume of water needed to dissolve impure KNO3 5 mL B. Mass of KNO3 crystals recovered — put data in right hand column in part IIIA. C. Analysis of recovered KNO3 crsytals — see section IIIB. EH23 . Frkcxh'och Cr\/S-\-Ai\(:bcghbm 1.3 q iJQflgl'CQ/k Szfioxf‘cafiom loosed om de—Q-eff/Mce, "A .S¢\Mb(\;+ies oi? .mixhrc, comPomemi—g. WC Sch/dole... Cmpom€m+_,. f3. pregemis 1'“ Cg... .Sm/xcx.\\.. QMAOMW‘E.,)'. §f..LO\"\ chu‘fl {fl ’ , \ so\ we) ‘ .. Sohxh‘om .. 0&3 IA$0\-€o\:l:5‘s€ go’W—xyo net/UP CFySfi/h’i‘e oak. SAMPLE. Mxxwéé‘... '(wemg«:.ox%) . ' ) w . (o—so lo) (0 40%» n “MA ' Assam). \‘0 R29 and Q'Vcer 4:": vacate; (SOL/416%) Add \5 drove Lle-HJO5 beH to SCd‘LLV‘G/Hovx gain-k (cfigue) 4M Coo\ +c S- ~1°C g/Azpcw 2.0L / whale. «:3st waa SoLwh‘o m I . > (LASth " diSCCLfd +23% (yr gnaw-7 35¢) “fights + 3m. #20 +65€ «was + 55¢ bM p143 mfare +0 swards ‘3‘ § Solublluy In a wlulmooa Hp 3 6 8 ate;- J, - “engwcqws «- wk, 4,5 “305-. __,Zl'ie*wxnoo —‘ {63(59)le Ml.nl‘mMM awowwf of. H2 , ' ' ' W‘ i O a?” ~r- r'ccwis’cauiaa + «Quay -, fel‘cz'r‘ d o w .1 -gfi" ‘7? +2131- recvvs-b.“ 1.264. .0. : be) No? . r. .K Meg-£0: pwf 6+, 2 % (Ls a”: 514,»; t 6 Mesg't\g.\6,§g INSG— BuL Hg» Experiment 3 Drawer number Ji— “ __ MM... v.— Advance Study Assignment: Resolution of Matter into Pure Substances, ll. Fractional Crystallization 1. Using Figure 1, determine a. the number of grams of KN03 that will dissolve in 100 g of H20 at 100°C. If you need to, see Appendix V for a discussion of how to interpret a graph. #20— g KNo3 b. the number of grams of water required to dissolve 20 g of KNO3 at 100°C. (Hint: your answer to la gives you the needed conversion factor for g KNO3 to g H20.) iofiwob >5 ‘53“1‘1‘22 —. 91.532150 2403 KM); 2.5 gH20 c. the number of grams of water required to dissolve 2.0 g“ CuSO4 - 5 H20 at 100°C. 2.0 Cu§04.§“;,0v10r;w+k’ - Filififirf) (iii/'4 git/’0 ————4' i d. the number of grams of water required at 100°C to dissolve a mixture containing 2 KN03 and 2.0 g CuSO4 - 5 H20, assumin that the solubilit of one su ' nit/i 9 [p C k, , affected by the presence of another. “‘ l ' .5? l _ 1' ~V_~‘_ "‘———\_‘ _ A”, J: :- §»ZL’;i’\2\’L? A {116420 :3 U flgHzo 4 . ’2 H v 2. To the solution in Problem 1d at 100°C, 15 g of water are added, and the solution is l» .3 \ cooled to 0°C. Wirill” Hg .4 if; D (*r‘r ’ 75‘ £150.) a. How much KN03 remains in solution? (See Fig. 1.) 0 ‘t ; 24 491:0 K 1311411.; : 2 .3 a; ICU“; 5”} H20 2 ,6 g KNo3 b. How much KNO3 crystallizes out? 293 KNO - 2 4 firm} ¢l_gKNO3 c. How much CuSO4 - 5 H20 crystallizes out? . ’ K wk [ixw‘qgé‘ 4~ cu QQVIfi‘Z-o fitment» Ln 1.31.14 it TN . L g Cuso4 - 5 H20 d. What percent of the KNO3 in the sample is recovered? i fl V {507° 304K140.) Asia/o Resolution of Matter into Pure Substances, H. Fractional Crystallization 47 ...
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