PAG 2-determination of concentration of hydrochloric acid

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Created on: 18-08-20 10:28

method part 1

weigh 2.10g of NaHCO3(s) into a 100cm^3 beaker, rinse weighing boat into beaker, add distilled water to dissolve solid with glass rod, transfer to volumetric flask and rinse into flask, until just below mark,insert stopper, invert several times,

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method part 1 part 2

make up to mark and repeat inversion.

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method part 2

transfer to beaker and label,use a pipette +filter and transfer 25cm^3 to conical flask, add methyl orange, fill burette with HCL, titrate with constant stirring until colour change occurs, repeat until you have concordant results to nearest 0.05cm^3

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control variables

volume of HCL-fill burette to 0, mass of NaHCO3(balance), volume of titrate (25)

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dependent variable

concentration of hydrochloric acid

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observations

turns yellow to orange

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what equations are needed

mean titr= sum of concordant results/no. of results used, n=c x v, %error x amount used/result

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evaluative points that increase concentration of HCL

some solid could have been spilt//if too much water was added//if pipette was washed

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evaluative points that decreases concentration of HCL

if burette was washed

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evaluative point causing inconsistency

if there was an air bubble present.

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Other cards in this set

Card 2

Front

method part 1 part 2

Back

make up to mark and repeat inversion.

Card 3

Front

method part 2

Back

Card 4

Front

control variables

Back

Card 5

Front

dependent variable

Back

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PAG 2-determination of concentration of hydrochloric acid