Respuesta :
Answer:
12.81.
Explanation:
- Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 liter of the solution.
M = (no. of moles of solute)/(Volume of the solution (L))
M = (mass/molar mass) NaCl / (Volume of the solution (L))
mass of Ba(OH)₂ = 274 mg = 0.274 g, molar mass of Ba(OH)₂ = 171.34 g/mol, Volume of water = 50.0 mL = 0.05 L.
M = (mass/molar mass) Ba(OH)₂ / (Volume of the solution (L)) = (0.274 g / 171.34 g/mol) / (0.05 L) = 0.03 M.
- Ba(OH)₂ is dissociated according to:
Ba(OH)₂ → Ba²⁺ + 2OH⁻,
Every 1.0 mol of Ba(OH)₂ gives 2.0 moles of OH⁻.
∴ [OH⁻] = 2(0.032 M) = 0.064 M.
∵ pOH = -log[OH⁻]
∴ pOH = -log(0.064) = 1.194.
∵ pH + pOH = 14.
∴ pH = 14 - pOH = 14 - 1.194 = 12.81.
The study of chemicals and bonds is called chemistry. There are two types of elements are there and these are metals and nonmetals.
The correct answer to the question is 12.81.
What is ph?
- pH, is a scale used to specify the acidity or basicity of an aqueous solution.
- Acidic solutions are measured to have lower pH values than basic or alkaline solutions
Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 liter of the solution.
Where
- M = (no. of moles of solute)/(Volume of the solution (L))
- M = (mass/molar mass) NaCl) / (Volume of the solution (L))
The data is given as follows:-
- Mass of Ba(OH)₂ = 274 mg = 0.274 g,
- Molar mass of Ba(OH)₂ = 171.34 g/mol,
- Volume of water = 50.0 mL = 0.05 L.
M = (mass/molar mass) Ba(OH)₂ / (Volume of the solution (L)) = (0.274 g / 171.34 g/mol) / (0.05 L) = 0.03 M.
Ba(OH)₂ is dissociated according to: [tex]Ba(OH)_2 ---- > Ba^{2+} + 2OH^-[/tex]
Every 1.0 mol of Ba(OH)₂ gives 2.0 moles of OH⁻.
[OH⁻] = 2(0.032 M) = 0.064 M.
pOH = -log[OH⁻]
pOH = -log(0.064) = 1.194.
pH + pOH = 14.
pH = 14 - pOH = 14 - 1.194 = 12.81.
Hence, the correct answer is 12.81.
For more information about the ph, refer to the link:-
https://brainly.com/question/14688752
