Question1)

A new potential heart medicine code-named X-281 is being tested by a pharmaceutical company Pharma-pill. As a research technician at Pharma-pill you are told that X-281 is a monoprotic weak acid but because of security concerns the actual chemical formula must remain top secret. The company is interested in the drugs Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.

To find the pKa of X-281 you prepare a 0.081 M test solution of X-281. The pH of the solution is determined to be 2.40. What is the pKa of X-281?

2)

Part A

Determine the [H3O+] of a 0.220 M solution of formic acid.

Express your answer using two significant figures.

Part B

Determine pH of this solution of formic acid.

Express your answer to two decimal places.

3)

Determine the pH of an HF solution of each of the following concentrations.

A

5.30102 M

Express your answer to two decimal places.

B

2.80102 M

Express your answer to two decimal places.

C

In which cases can you not make the simplifying assumption that x is small?

In which cases can you not make the simplifying assumption that x is small?only in (a)only in (b)in (a) and (b)in (b) and (c)4)

A 9.5102 M solution of a monoprotic acid has a percent dissociation of 0.59%.

Part A

Determine the acid ionization constant (Ka) for the acid.

Express your answer using two significant figures.

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