Convert between Ka and pKa.

In the subtopic Weak acids, Ka and pKa (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on convert between Ka and pKa. It belongs to Acids and bases (A-level only), so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include Ka, pKa. PKa. means the negative logarithm of the acid dissociation constant (Ka), used to express the acidity of a solution Avoid the mistake of students often confuse the relationship between Ka and pKa, incorrectly using the formula pKa = -log(Ka) without proper substitution; instead, to correctly convert between Ka and pKa, use the formula pKa = -log(Ka). For example, if Ka = 1.0 x 10^-5, substitute this value: pKa = -log(1.0 x 10^-5). Calculate: pKa = 5.0. Thus, the final answer is pKa = 5.0 For exam answers, use the formula pKa = -log(Ka) to convert between Ka and pKa values