Description

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Quantitative Base Determination by

HCl Titration

Fill-in all shaded cells, experimental data is entered in the darker shaded cells

Name:

Unknown Number:

%Na2CO3 in unknown (filled-in by grader):

Absolute error %Na2CO3 (raw grade based on this):

Constant

Na2CO3 molar mass,

g/mol

105.988

Stoichiometric ratio:

HCl/Na2CO3

2:1

Note 1: Include all data from all analyses. If an analysis is excluded from your results, report the experimental data but leave the corresponding calculated

results cells (lighter shading) blank.

Note 2: If entries are truncated by Excel to fewer decimal places than required, highlight the cell(s). On the HOME tab click the increase decimal icon on the

number men to increase the displayed number of decimal places as appropriate.

Standardization Titrations

Sample #

1

2

3

4

5

Na2CO3 mass (mg)*

Na2CO3 moles (mmol)*

HCl moles (mmol)*

HCl volume (mL)

Average HCl molarity*:

Unknown Titrations

Sample #

Unknown Mass (mg)

HCl Volume (mL)

Average HCl molarity

(mmol/mL)*

1

2

3

4

5

Average mass %Na2CO3 in unknown^:

Standard deviation of %Na2CO3 in unknown:

Confidence Interval Calculation

Confidence Level

n=

Degrees of freedom =

t=

95%

95% Confidence Interval of %Na2CO3 in unknown = +/Interval

to

*report results to one more digit than allowed by applying the rules of significant figures, sf

^report (round) result to the correct number of sf by applying the rules of sf

HCl moles (mmol)*

d in the darker shaded cells

t leave the corresponding calculated

click the increase decimal icon on the

HCl Molarity (mmol/mL)*

Na2CO3 moles (mmol)*

Na2CO3 mass (mg)*

%Na2CO3*

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