Questions from General Chemistry

Q: Identify the principal conjugate acid-base pair and calculate the ratio

Identify the principal conjugate acid-base pair and calculate the ratio between them in a solution that is buffered to pH 9.00 and contains a. H2S. b. ethylenediamine dihydrochloride. c. H3AsO4. d....

Q: What mass (g) of Na2HPO4 . 2H2O must be added

What mass (g) of Na2HPO4 . 2H2O must be added to 750 mL of 0.160 M H3PO4 to give a buffer of pH 7.30?

Q: A coating that weighs at least 2.00 mg is needed

A coating that weighs at least 2.00 mg is needed to impart adequate shelf life to a pharmaceutical tablet. A random sampling of 200 tablets revealed that 16 failed to meet this requirement. a. Use thi...

Q: What mass (g) of dipotassium phthalate must be added to

What mass (g) of dipotassium phthalate must be added to 750 mL of 0.0500 M phthalic acid to give a buffer of pH 5.75?

Q: . What is the pH of the buffer formed by mixing 50

. What is the pH of the buffer formed by mixing 50.0 mL of 0.200 M NaH2PO4 with a. 50.0 mL of 0.100 M HCl? b. 50.0 mL of 0.100 M NaOH?

Q: What is the pH of the buffer formed by adding 100 mL

What is the pH of the buffer formed by adding 100 mL of 0.150 M potassium hydrogen phthalate to a. 100.0 mL of 0.0800 M NaOH? b. 100.0 mL of 0.0800 M HCl?

Q: How would you prepare 1.00 L of a buffer with

How would you prepare 1.00 L of a buffer with a pH of 9.45 from 0.300 M Na2CO3 and 0.200 M HCl?

Q: Ammoniacal nitrogen can be determined by treatment of the sample with chloroplatinic

Ammoniacal nitrogen can be determined by treatment of the sample with chloroplatinic acid; the product is slightly soluble ammonium chloroplatinate: The precipitate decomposes on ignition, yielding me...

Q: How would you prepare 1.00 L of a buffer with

How would you prepare 1.00 L of a buffer with a pH of 7.00 from 0.200 M H3PO4 and 0.160 M NaOH?

Q: How would you prepare 1.00 L of a buffer with

How would you prepare 1.00 L of a buffer with a pH of 6.00 from 0.500 M Na3AsO4 and 0.400 M HCl?