# chemistry

posted by .

A reaction produced 0.40 mmol of H in a buffered solution which contained 300ml of 0.06M succinate buffer, pH is 4. What was the pH of the medium after the reaction was completed? The pKa of succinate buffer is 4.21

• chemistry -

Let's just call these acid(A) and base(B),
pH = 4.21 + log B/A
B/A = 0.6 but you should obtain the exact answer.
You know A + B = 0.06.
Solve the two equations simultaneously to find A and B. I obtained approximately 0.02 for B and 0.04 for A.

300 mL x 0.04 = approximately 12 mmols A.
300 mL x 0.02 = approx 6 mmols B.
...........B + H^+ ==> A
Initial....6...0.......12
change...-4..-4.......+4
Equil......2..0........16

Substitute the E line (remember to use your answers instead of my approximations) into the HH equation and solve for the new pH. I obtained about 3.7 or so.

## Similar Questions

1. ### CHEMISTRY

HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong …
2. ### chemistry-buffer

Buffer question: If I add 3 mL of 1 M NaOH to a buffered solution, will I still have a valid buffer?
3. ### chemistry

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS …
4. ### chemistry

Will this solution form a buffer? 100 mL of .10 M NH3; 100 mL of .15 M NH4Cl Work: NH3= .01 moles NH4Cl= .015 moles .... not sure what else to do. I think we use the H-H equation, but I don't know how to find pKa, or even what pKa
5. ### Chemistry

A 1X Phosphate Buffered Saline solution was prepared by adding 1.44g of Na2HPO4 and 1.44g of H2PO4- to 800mL of water. Additional components were dissolved in the solution: 8g of NaCl, 0.2g of KCl and 0.24g KH2PO4. The resulting buffer …
6. ### chemistry

. An enzyme-catalyzed reaction was carried out in a 0.2M �Tris� buffer, pH 7.8. As a result of the reaction, 0.03 mole/liter of H+ was produced. (pKa of Tris =8.1) (a) What was the ratio of Tris+ (conjugate acid) / Triso …
7. ### Chemistry

Assume you have prepared 100.0 mL of a buffer solution using 0.400 mol of acetic acid (pKa = 4.74) and 0.400 mol of sodium acetate. The pH of this buffer solution is initially 4.74. After preparing this buffer solution, you added 55.0 …
8. ### chemistry

an ezyme -catalysed reaction was carried out in a solution buffered with 0.05 M phosphate ph 7.2 . As a result of the reaction ,0.06M of acid was formed. (phosphoric acid has three pka values. The one required for this calculation …
9. ### Biochemistry

An enzyme-catalyzed reaction was carried out in a 0.2M �Tris� buffer, pH 7.8. As a result of the reaction, 0.03 mole/liter of H+ was produced. (pKa of Tris =8.1) (a) What was the ratio of Tris+ (conjugate acid) / Triso …
10. ### chemistry

How many grams of dipotassium succinate trihydrate (K2C4H4O4ยท3H2O, MW = 248.32 g/mol) must be added to 790.0 mL of a 0.0522 M succinic acid solution to produce a pH of 5.872?

More Similar Questions