Question

In: Chemistry

Calculated the PH of the prepared buffer of 0.50 ml of 1.0M of NaOH is added...

Calculated the PH of the prepared buffer of 0.50 ml of 1.0M of NaOH is added to 50mL of the buffer.
Required Buffer (Volume, Concentration, pH)
50 mL of 0.05 M pH 12.0 buffer

Chosen Acid/ Conjugate Base Pair: Na2HPO4 / Na3PO4
Amount of Acid: 0.2498 g
Amount of Conjugate Base: 0.1227 g
Measured PH:10.92

Solutions

Expert Solution

mass of Na2HPO4 = 0.2498 g

moles of acid = 0.2498 / 141.9588 = 1.76 x 10^-3

moles of conjugate base = 0.1227 / 163.94 = 7.484 x 10^-4

moles of NaOH added = 0.5 x 1 / 1000 = 5 x 10^-4 (C)

pH = pKa + log [conjugate base + C / acid - C]

      = 12.32 + log [7.484 x 10^-4 + 5 x 10^-4 / 1.76 x 10^-3 - 5 x 10^-4 ]

      = 12.32

pH of the prepared buffer = 12.32

                                        

queen_honey_blossom answered 2 years ago
Next > < Previous

Related Solutions

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of...
A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH2PO4. How many moles of HCl must be added to this buffer solution to change the pH by 0.25 units? Assume the total volume remains unchanged at 400 mL. For H2PO4-, Ka = 6.3 × 10-8.
For a titration of 100m of 1.0M HCN, you added so far 98ml of 1.0M NaOH....
For a titration of 100m of 1.0M HCN, you added so far 98ml of 1.0M NaOH. Have you reached the equivalence point? If not what is the current pH? Ka for HCN = 4.5 x 10^-4
Calculate the pH if 10mL of 0.1 M NaOH are added to the buffer made by...
Calculate the pH if 10mL of 0.1 M NaOH are added to the buffer made by mixing 25 mL of 1.0 M CH3COOH and 25 mL of 0.5 M CH3COONa.
Buffer 1) 100 mL of 0.50 M sodium phosphate buffer, pH 7.0 MW; 137.99
Buffer 1) 100 mL of 0.50 M sodium phosphate buffer, pH 7.0 MW; 137.99
What is the pH of a buffer that is prepared by mixing 30.0 mL of 1.0...
What is the pH of a buffer that is prepared by mixing 30.0 mL of 1.0 M HF and 20.0 mL of 2.0 M KF? (Ka for HF 7.2 x 10−4) What is the pH of a solution that contains 0.40 M CH3COOH and 0.30 M CH3COONa at 25°C (Ka=1.8 x 10−5)?
What is the pH of a buffer that is prepared by mixing 30.0 mL of 1.0...
What is the pH of a buffer that is prepared by mixing 30.0 mL of 1.0 M HF and 20.0 mL of 2.0 M KF? (K a a for HF 7.2 x 10 −4 )
a) What is the pH of a buffer solution prepared by mixing 120 mL of a...
a) What is the pH of a buffer solution prepared by mixing 120 mL of a 0.435 M CH3CO2H with 50 mL of a .286 M CH3CO2Na solution? CH3CO2H Ka = 1.75 x 10-5 b) What is the resulting pH if we add 10.2 mL of a .513 M HCl solution to this buffer? Does the pH make sense? Why/why not? c) What is the resulting pH if we add 3.56 mL of a 0.420 M NaOH solution to the...
determine the pH at each stage: (a) before adding 0.50 M of NaOH to 25.0 mL...
determine the pH at each stage: (a) before adding 0.50 M of NaOH to 25.0 mL of 0.45 M HCl (b) after adding 15.00 mL of NaOH to 25.00 mL of 0.45 M of HCl. (c) at the equivalent point (D) after adding 35.00 mL 0.50 M of NaOH to 25.00 mL of 0.45 M HCl
How much 5.80 M NaOH must be added to 500m0 mL of a buffer that is...
How much 5.80 M NaOH must be added to 500m0 mL of a buffer that is .0190 M acetic acid and .0265 M sodium acetate to raise the pH to 5.75?
how much 6.00 m naoh must be added to 610.0 ml of a buffer that is...
how much 6.00 m naoh must be added to 610.0 ml of a buffer that is 0.0185 m acetic acid ad 0.0235 m sodium acetate to raise the ph to 5.75?
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT