Chemistry Answers

n a Laboratory, you have the following chemicals available:

1.0 M NaOH, 1.00 M HCl, 1.00 M H3PO4, NaH2PO4 (s), Na2HPO4 (s), and Na3PO4 (s).

Describe TWO ways of making 1000 mL of a buffer of pH = 12 (Use only the above

chemicals, plus distilled water.)

[Given: H3PO4 - Ka1 = 6.9 x 10-3

; NaH2PO4 - Ka2 = 6.2 x 10-8

; Na2HPO4 - Ka3 = 4.8 x 10-13

]

n a Laboratory, you have the following chemicals available:

1.0 M NaOH, 1.00 M HCl, 1.00 M H3PO4, NaH2PO4 (s), Na2HPO4 (s), and Na3PO4 (s).

Describe TWO ways of making 1000 mL of a buffer of pH = 12 (Use only the above

chemicals, plus distilled water.)

[Given: H3PO4 - Ka1 = 6.9 x 10-3

; NaH2PO4 - Ka2 = 6.2 x 10-8

; Na2HPO4 - Ka3 = 4.8 x 10-13

]

Hydrofluoric acid has a Ka value of 7.2x10−4. What is the pH of a 0.04M solution of hydrofluoric acid

Determine the mass (in g

g) of each sucrose solution that contains 19 g

g of sucrose.

4.6 %

% sucrose by mass  = g

3.4 %

% sucrose by mass  = g

12.3 %

% sucrose by mass = g

Why do pressure cookers save time in the kitchen? Explain the effect of pressure on boiling point

Meat I'd stored in a refrigerator to last longer

What happen when 18% HCl Solution React with 1060 grade pure aluminum tube?

the electron of cathod ray takes the place of knocked out electron.

Explain the structures of a momoene and a diene.

Give reason for the following:

(i) Ethanoic acid is more acidic than ethanol.

(ii) Aniline is less basic than ammonia.