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Practice Exam 1 Sp 2014_Final
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ANSWER SCHEME FOR SCHOOL ASSESSEMENT CHEMISTRY PRACTICAL PAPER 4 (962/4) (962/4 ) FIRST TERM
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EXPERIMENT 1
Title: Purpose: Material:
Volumetric analysis -stoichiometry To th the exact concentration of a monobasic acid, HX !i"#1 is a solution of HX $ith concentration bet$een %&' molcm to 1&% mol dm -( !ii" solid sodium hydroxide !iii" phenolphthalein indicator
pparatus: pparatus:
!i"one )'&%cm ( pipette and pipette filler !ii"one '%cm ( burette !iii"a 1%%cm ( *olumetric flas+ and stopper !i*" retort stand and clamp !*i"one $hite tile !*ii" one $ash bottle filled $ith distilled $ater !*iii" electronic balance !ix" spatula !x" 1%% cm ( bea+er
-(
ntrodu ntroductio ction: n: The exact exact concen concentrat tration ion of an aueou aueous s solution solution of an acid acid can be determined by titration $ith a standard al+aline solution li+e sodium hydroxide solution&.odium is a stron/ base and $ill react $ith either a stron/ acid or a $ea+ acid causin/ the pH to decrease sharply $ithin the ran/e of pH ( to pH 11&The pH ran/e for phenolphthalein indicator is from pH 0&) to pH 1%&%&Therefore it is a suitable indicator& 1&n emp emptty dry dry 1%%c %%cm ( bea+er is $ei/hed and its mass recorded )&&%/ of solid sodium hydroxide is $ei/hed accurately inside the bea+er and its mass recorded (&The solid sodium hydroxide is dissol*ed $ith distilled and Read Free Foron 30this Days Sign up to vote title is poured into a 1%%cm ( *olumertic flas+&Distilled $ater is added Not useful Useful Cancel anytime. until the *olume of the solution reached exactly the 1%%cm ( Special offer for students: Only $4.99/month. mar+&The flas+ is stoppered and sha+en&This solution is labelled Proc rocedu edure: re:
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!b" 6urette readin/s Titration no
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aX !a" 4 H);!l"
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D) is /i*en for completion of experiment $ithin a specified time
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Maximum mar+ for s+ill 6 8 ' mar+s
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s+ill D 8 < mar+s
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EXPERIMENT 2
Topic: Volumetric analysis = cid base and redox
Purpose: To determine the mass of sodium ethanedioate used to preparation contain sodium ethanedioate and hydrated ethanedioic acid& !b"
!i"9orrect readin/s-initial and final readin/s recorded in the correct spaces and to t$o decimal places except for >ero !ii" .ufficient readin/- as least t$o *olume readin/s $ithin the ran/e of %&1%!%&)%" !iii" 9orrect a*era/e set = correct difference ber$een final and initial readin/ !minus correctly" !i*"9orrect mean - arithmetic mean for titres used5obtained to t$o decimal places !*" ccuracy = difference in mean *alue bet$een the teacher and the student T$o mar+s for the difference bet$een %&%% cm ( amd %&(%cm ( ;ne mar+ for the difference bet$een %&(% cm ( and %&'% cm (
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Ma 8 1&@ X xi 5!1@x )'&%" 8y 1
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!/"
?9)%)-C from #1 and H )9);C Therefore concentration of 9 );)- from sodium ethanedioate 8?9);)-C from #1 = ? 9 );)-C from H)9); 8y) = y1 8 y(
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a)9); )a4 4 9);)1 mol of a )9); 8 1 mol of 9 );)3MM a)9); 8 1(/mol -1 9oncentration of a )9); 8y( Mass of a )9); 8 y( X 3MM a )9); 8 >) /
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mass of a)9); FFFFFFFFFFFFFFFFFFF x 1%%E !mass of a )9); 4mass a)9);" 8 >) FFFFFFFFFFFFFFFFFFFF x 1%%E ?>) 4 y1 !3MM H)9);"C
You're Reading a Preview
Maximum mar+s for s+ill 6 8' mar+s s+ill 9 82 mar+s Unlock full access with a free trial. Download With Free Trial
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EXPERIMENT 3
Topic: Vol!"#$ic %&%l'i P$i#' %&* #oic+io!"#$' P$po": To *"#"$!i&" #+" p$i#' o, % %!pl" o, o*i! lp+i#" (*) (") (,) (i)
M.V.(I2)/M2V2(S 2O20) 1 V.(I2) 1 x c! 35c! 0 1 y c! 7S2O208 1 53/235 ' 1 z !ol*!0 O$ M.V. (S2O20)/M2V2(I 2) 1 ./. (M. 235)/ (53 y ) 1./. M. 1 53 y /235 1 z !ol*!0 M% o, N%2S i& 23c! 1 RMM N%2SO 1 p (;$%!)
(ii) (;)
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M%i!! !%$= ,o$ =ill > 1 3 !%$=
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EXPERIMENT 4
Topic: R"%c#io& =i&"#ic P$po": To *"#"$!i&" #+" "?"c# o, #"!p"$%#$" o& #+" $"%c#io& $%#"5 (*)
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T"!p"$%#$" i&c$"%"@ $%#" $"%c#io& %lo i&c$"%" R%#" o, $"%c#io& %# 4 oC +i;+"$ #+%& oC N!"$ o, "?"c#iB" colliio& i&c$"%"5i&"#ic "&"$;' o, #+" You're Reading a Preview p%$#icl" i&c$"%"
