1. A solution was made by dissolving 0.837g of Ba(OH)2 in 100 mL of solution. What is the pOH and pH of the solution?

2. What is the percentage ionization of 1.0M acetic acid? What is the pH of this solution?

1. pOH = 1.01 and the pH = 12.99.

2. a) %I = 0.417 %, b) pH =  2.34.  

Explanation:

1. The pH of the dissolution of Ba(OH)₂ in water can be calculated using the following equation:

To find the pOH, first, we need to calculate the concentration (C) of Ba(OH)₂:

Where:

η: is the number of moles of Ba(OH)₂

V: is the volume of the solution = 100 ml = 0.100 L

M: is the molar mass of Ba(OH)₂ = 171.34 g/mol

m: is the mass of Ba(OH)₂ = 0.837 g          

Knowing that in 1 mol of Ba(OH)₂ we have two moles of OH⁻, the concentration of OH⁻ is:

Now, we can find the pOH and the pH of the solution:

2. a) The percentage of ionization (% I) of acetic acid can be calculated using the following equation:

We need to find the [H⁺] = [H₃O⁺] at the equilibrium:

CH₃COOH(aq) + H₂O(l) → CH₃COO⁻(aq) + H₃O⁺(aq)  

 1.0 - x                                        x                   x

Ka: is the dissociation constant of acetic acid = 1.75x10⁻⁵

    (1)  

By solving equation (1) for x we have two solutions:

x₁ = -0.00417

x₂ = 0.00417 = [H₃O⁺] = [CH₃COO⁻]  

We will take the positive value to find the percentage ionization:          

b) The pH of the solution is:

I hope it helps you!          

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.