the ph of a 0.280m solution of a weak base. B has been measured ph --8.69. using this information. calculate the base ionisationconstant kbof b

To calculate the base ionization constant (Kb) of a weak base using the given pH value, you can use the formula:

Kb = 10^(-pOH)

First, we need to find the pOH value, which is the negative logarithm of the hydroxide ion concentration in the solution. Since we have the pH value, we can use the relationship:

pH + pOH = 14

Rearranging the equation, we get:

pOH = 14 - pH

Given that the pH is 8.69, we can find the pOH using the formula:

pOH = 14 - 8.69

pOH = 5.31

Now that we have the pOH, we can calculate the base ionization constant (Kb) using the formula:

Kb = 10^(-pOH)

Kb = 10^(-5.31)

Calculating this, we find that the base ionization constant (Kb) of the weak base B is approximately 4.47 x 10^(-6).