us. What is the pH of a 0.02577 M NaOH solution? 48. 49. When Oz is collected ov

Question

us. What is the pH of a 0.02577 M NaOH solution? 48. 49. When Oz is collected over water the gas collected is a mixture of O and water vapor. The partial pressure of water in the air above liquid water at room temperature is 19.8 torr. This means the collected sample is a mixture of O2 and water and Phoo in the mixture- 19.8 torr. Assume the total pressure of the gas you collected was 763.3 mmHg. a. What is the partial pressure of O2 in the gas you collected? b. If you collected 271.8 mL of gas at 23.50°C, how many moles of O2 did you collect? 50. A be changed if we want the volume to be 3.000 L? Assume a fixed sample at constant temperature. sample of Heg occupies 2.500 L under a pressure of 788.02 mmHg. To what must the pressure, in atm, a. How would you change the temperature in order to increase the concentration of Co, b. How would you change the concentration of CO in order to shift the equilibrium to the right? 52. New pennies have a mass of about 2.5 g and are made mostly of zine (Zn). There are about 2.4 g of zinc in a penny, the rest is copper plate. How many individual zinc atoms are in one penny? 53, what is the pH ofa buffer that is 1.103 M formic acid (HCOH) and 1.027 M formate ion (HCO)?

Explanation / Answer

Ans 48

NaOH is strong base and completely dissociates into water

NaOH = Na+ + OH-

[NaOH] = [OH-] = 0.02577 M

We know that

[H+] [OH-] = 10^-14

[H+] = 10^-14 / (0.02577) = 3.88 x 10^-13 M

pH = - log [H+] = - log (3.88 x 10^-13)

= 12.41

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