PartA 0.80 g of hydrogen chloride (HCl) is dissolved in water to make 8.0L of so

Question

PartA 0.80 g of hydrogen chloride (HCl) is dissolved in water to make 8.0L of solution. What is the pH of the resulting hydrochloric acid solution? Express the pH numerically to two decimal places. View Available Hint(s) pH-2.7 Submit Previous Answers X Incorrect:; Try Again; 4 attempts remaining Part B 0.45 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 7.5 L of solution. What is the pH of this solution? Express the pH numerically to two decimal places. View Available Hint(s) pH = Submit

Explanation / Answer

mass of HCl = 0.80 grams

molar mass of HCl= 36.5 gram/mole

volume = 8.0L

number of moles = mass/molar mass = 0.80/36.5 =0.0219 moles

Concentration= number o fmoles/volume

concentration = 0.0219/8.0 = 0.0027375M

[H+]= 0.0027275M

-log[H+] = -log(0.0027275)

PH= 2.56

B)

mass of NaOH= 0.45 grams

molar mass of NaOH = 40.0grams

number of moles = 0.45/40 = 0.01125 moles

volume = 7.5L

concentration = 0.01125/7.5= 0.0015M

[OH-] = 0.0015M

-log[OH-] = -log(0.0015)

POH= 2.82

PH+POH= 14

PH= 14-POH

PH= 14-2.82

PH= 11.18

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