Final answer:
To calculate the pH from the hydroxide ion concentration of 1.8 x 10^-10, first compute the pOH, which is 9.74. Then subtract this from 14 to find the pH, which is 4.26. This result does not match the provided options, so it's suggested to check the question for accuracy.
Step-by-step explanation:
To calculate the pH of a solution using the hydroxide ion concentration (OH-), you first need to determine the pOH. Since the hydroxide ion concentration given is 1.8 x 10-10, we calculate the pOH by taking the negative logarithm:
pOH = -log(OH-) = -log(1.8 x 10-10)
Compute the pOH value first:
pOH = -log(1.8 x 10-10) ≈ 9.74
Now, to find the pH, subtract the pOH from 14:
pH = 14 - pOH = 14 - 9.74 = 4.26
Therefore, the pH of the solution is 4.26, which is not one of the provided options. There might be a misunderstanding or a typo in the question or options listed. Based on the given hydroxide concentration, option 'a' would be closest to the calculated pH, but given that this is a significant deviation, it is advised to revisit the question and verify the values and options provided before making a final selection.