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* What is the pH if 10 mL of 0.3 M HCl is added to 100mL of a 0.13 M phosphate buffer that has a

starting pH of 7.2.

What is the pH of a buffer if 5.0 grams of sodium hydrogen phosphate and 4.2 g of sodium

dihydrogen phosphate are added to 300 ml of distilled water?
What is the pH of a buffer if 34.2 grams of sodium hydrogen phosphate and 12.5 g of sodium

dihydrogen phosphate are added to 300 ml of distilled water? What is the molarity of phosphate ion in

this buffer?

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Related questions

please show work and explanations. please.

- A flask contains 300 mL of 0.13 M phosphate buffer that has a pH of 7.5. What volume of 0.2 M

HCl should be added to drop the pH to 6.7.
- A flask contains 300 mL of 0.13 M phosphate buffer that has a pH of 7.3. What volume of 0.2 M

HCl should be added to drop the pH to 6.6.

-A flask contains 100 mL of 0.12 M phosphate buffer that has a pH of 7.1. What volume of 0.3

M HCl should be added to drop the pH to 6.9.

-A flask contains 600 mL of 0.16 M phosphate buffer that has a pH of 7.4. What volume of 0.3 M

HCl should be added to drop the pH to 6.6.

- A flask contains 200 mL of 0.5M phosphate buffer that has a pH of 7.6. What volume of 0.1 M

HCl should be added to drop the pH to 6.8.

-A flask contains 100 mL of 0.1 M phosphate buffer that has a pH of 7.0. What volume of 0.1M

NaOH should be added to increase the pH to 7.4?

What is the pH of 20 mL of 0.14M acetic acid?

What is the pH of 40 mL of 0.14M acetic acid?

redgoose873

please show work and explanations. please.

- A flask contains 300 mL of 0.13 M phosphate buffer that has a pH of 7.5. What volume of 0.2 M

HCl should be added to drop the pH to 6.7.
- A flask contains 300 mL of 0.13 M phosphate buffer that has a pH of 7.3. What volume of 0.2 M

HCl should be added to drop the pH to 6.6.

-A flask contains 100 mL of 0.12 M phosphate buffer that has a pH of 7.1. What volume of 0.3

M HCl should be added to drop the pH to 6.9.

-A flask contains 600 mL of 0.16 M phosphate buffer that has a pH of 7.4. What volume of 0.3 M

HCl should be added to drop the pH to 6.6.

- A flask contains 200 mL of 0.5M phosphate buffer that has a pH of 7.6. What volume of 0.1 M

HCl should be added to drop the pH to 6.8.

-A flask contains 100 mL of 0.1 M phosphate buffer that has a pH of 7.0. What volume of 0.1M

NaOH should be added to increase the pH to 7.4?

What is the pH of 20 mL of 0.14M acetic acid?

What is the pH of 40 mL of 0.14M acetic acid?

A buffer solution is prepared by mixing 66.3 mL of 0.0409 M sodium dihydrogen phosphate with 90.1 mL of 0.855 M sodium hydrogen phosphate.

A table of pKa values can be found here. http://chemresources.chemistry.dal.ca/firstyear/acid_base.html

1. Calculate the pH (to two decimal places) of this solution.

Assume the 5% approximation is valid and that the volumes are additive.

2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 0.361 g of sodium hydrogen phosphate (Na₂HPO₄) to the buffer solution above.

Assume 5% approximation is valid and that the volume of solution does not change.