CHEM 14BL Final: Practice Final Key

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whiteraccoon303

25 Aug 2015

School

UCLA

Department

Chemistry and Biochemistry

Course

CHEM 14BL

Professor

Henary Maher

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Document Summary

Chemistry 14bl practice midterm key (a) 10. 00 ml of 0. 0500 n hno3 (beaker) titrated with 0. 100 n naoh (buret: sketch the titration curves for each of the following systems. Calculate and indicate on each sketch, the equivalence point volume, the initial ph of the solution, and at least one other ph on the titration curve. Also be sure to indicate the approximate ph of the equivalence point if this is not the second point that you choose. This is the titration of a strong acid with a strong base. The shape will look like the data sets for the hcl naoh which are available on voh. The initial ph is due to the complete dissociation of the nitic acid. The equivalence point ph is 7 (calculation of other points require more arithmetic. Any other ph can be calculated prior to the equivalence point by considering the untitrated acid in the flask.

Related Questions

62. Two 25.0-ml samples, one 0.100 M HCl and the other 0.100 M HF, are titrated with 0.200 M KOH. a. What is the volume of added base at the equivalence point for each titration? b. Is the pH at the equivalence point for each titration acidic, basic, or neutral? c. Which titration curve has the lower initial pH? d. Sketch each titration curve.

Consider these three titrations: (i) the titration of 25.0 mL of a 0.100 M monoprotic weak acid with 0.100 M NaOH (ii) the titration of 25.0 mL of a 0.100 M diprotic weak acid with 0.100 M NaOH (iii) the titration of 25.0 mL of a 0.100 M strong acid with 0.100 M NaOH. Which statement is most likely to be true?

All three titrations require the same volume of NaOH to reach their first equivalence point.

All three titrations have the same initial pH.

All three titrations have the same pH at their first equivalence point.

1)Which of the following describes the process of titration ?

When an acid has exactly neutralized a base, or vice versa To cause a separation from solution or suspension

The technique of accurately measuring the volume of a solution required to react with another reagent

Any of various multiple oxides of titanium dioxide with other metallic oxides

In the titration of a weak acid with a strong base, the point at which the number of moles of acid equal the number of moles of base is called the ________.

titration point

equivalence point

half equivalence point

dissociation point

At the __________, the pH = pK_a.

Titration point

equivalence point

Half equivalence point

dissociation point

The equivalence point in the titration of 25.00 mL of acetic acid with 0.0987 M NaOH was determined to be 24.5 mL. What is the concentration of the acetic acid solution?

		0.0967 M
		96.7 M
		0.101 M

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CHEM 14BL Final: Practice Final Key

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