# chemistry

How would you do this question:

A student dissolved 5.0 g of vitamin C in
250 mL of water. The molar mass of ascorbic acid is 176 g/mol, and its Ka is 8.0 × 10−5. Calculate the pH of the solution. Note: Abbreviate the formula of ascorbic acid to HAsc.

1. 👍 0
2. 👎 0
3. 👁 265
1. mols HAsc = 5/molar mass = approx 0.03 but you need to do it more accurately.

........HAsc ==> H^+ + Asc^-
I......0.03......0......0
C.......-x.......x.......x
E......0.03-x....x......x

Substitute the E line into Ka expression for HAsc and solve for x, then convert to pH.

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### chemistry

Fish-liver oil is a good source of Vitamin A. When 0.1232 g of fish liver oil is dissolved in 500. mL of solvent, an absorbance of 0.724 is recorded. When 0.00167 g of Vitamin A is dissolved in 250. mL of solvent, an absorbance of

asked by David on February 8, 2011
2. ### chem

Fish-liver oil is a good source of Vitamin A. When 0.1232 g of fish liver oil is dissolved in 500. mL of solvent, an absorbance of 0.724 is recorded. When 0.00167 g of Vitamin A is dissolved in 250. mL of solvent, an absorbance of

asked by David on February 7, 2011
3. ### chemistry

Fish-liver oil is a good source of Vitamin A. When 0.1232 g of fish liver oil is dissolved in 500. mL of solvent, an absorbance of 0.724 is recorded. When 0.00167 g of Vitamin A is dissolved in 250. mL of solvent, an absorbance of

asked by dave on February 6, 2011
4. ### Chem 2

Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K.

asked by Bri on February 20, 2014
5. ### chemistry

A vitamin C tablet containing 250 mg of ascorbic acid (C6H7O6; Ka = 8.0 x 10-5 is dissolved in a 250 mL glass of water. What is the pH of the solution? i tried answering this question multiple times but i still get it wrong....

asked by Finding the pH of a weak acid? on March 20, 2012
1. ### Vitamins

Vitamins that may cause toxicity if ingested in too large amounts are: 1.vitamin A,vitamin C, and thiamin 2.vitamin C, riboflavin, and thiamin 3.vitamin A,vitamin D,and pyridoxin(B6) 4.vitamin D,vitamin C, and B12 Doesn't vitamin

asked by Gail and Trish on April 20, 2007
2. ### Chem 2

Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K. I posted this

asked by Bri on February 21, 2014
3. ### CHEM

A 0.552 g sample of ascorbic acid(Vitamin C) was dissolved in water to a total volume of 20.0 ml and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 ml. The pH of the solution at 10.0 ml of added base was 3.72.

asked by Cooper on March 21, 2012