CHE 110L Lecture Notes - Lecture 6: Molar Concentration, Molar Mass, Phenolphthalein

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bluecockroach554

29 Jul 2018

School

Quinnipiac University

Department

Chemistry

Course

CHE 110L

Professor

David Stilwell

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Document Summary

The procedure for this experiment can be found on pages 55-57 in general chemistry. Carbon copies of the data table have been attached to the back of this lab report. 204. 22g khp = 0. 002938 mol khp: molarity of naoh. 1 x: 0. 555g khp, 0. 560g khp x x, 0. 600g khp. 0. 0264 l = 0. 1022m: m = 0. 00278 mol, m = 0. 002742 mol. 3: avg deviation of m = |0. 1022m-0. 1036m| + |0. 1061m-0. 1036m| + |0. 1025m-0. 1036m| 0. 1036m 0. 0017: number of moles in unknown acid: Moles=m*v: 0. 1036m * 0. 01833l = 0. 001899 mol, 0. 1036m * 0. 02082l = 0. 002157 mol, 0. 1036m * 0. 01896l = 0. 001964 mol, molar mass = 0. 001964 mol = 150. 7 g/mol: average molar mass of unknown acid. 148. 2g/mol 5. 676: average deviation of unknown acid. The purpose of this lab was to standardize a sodium hydroxide solution by titration with potassium hydrogen phthalate, khp, using phenolphthalein as the indicator.

Related Questions

Molarity of standard NaOH solution: x/1 H 2/3 Unknown + 2/3 NaOH -> 2/3 H2O +Na 2/3 Acetate

Vinegar:	Titration 1	Titration 2	Tirtration 3
Initial V of Acid	.01 mL	5.56 mL	11.32 mL
Final V of Acid	5.56 mL	10.71 mL	16.02 mL
Inital V of Base	.01 mL	27.12 mL	3.01 mL
Final V of Base	22.23 mL	44.71 mL	24.90 mL

Unknown Acid code and number of reactive hydrogens: H+3

Unknown Acid	Titration 1	Titration 2 (Error)	Titration 3	Titration 4
Mass of Acid	.1024 g	.1028g	.1021g	.1023g
Initial V of Base	24.90 mL	37.80 mL	45.5 mL	9.24 mL
Final V of Base	37.80 mL	45.5 mL	9.24 mL	17.80 mL

7. Assuming that the density of vinegar is the same as the density of water, find the mass of vinegar for each titration, and calculate the mass percent of acetic acid forthat titration. (You looked up the density of water back in the measurement lab.)

8. Average your three mass percents of acetic acid to get your final answer for the

mass percent of acetic acid.

9. Find the volumes of base solution for each of your unknown acid titrations.

CHE 110L Lecture Notes - Lecture 6: Molar Concentration, Molar Mass, Phenolphthalein

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