The useful buffer range is defined by the equation ph = pka ± 1 calculate the range of the ratio of [conjugate base]/[acid] that corresponds to this equation. 0 ≤ [conjugate base]/[acid] ≤ 1 10 ≤ [conjugate base]/[acid] ≤ 1.0 0.1 ≤ [conjugate base]/[acid] ≤ 10 10 ≤ [conjugate base]/[acid] ≤ 100 1.0 ≤ [conjugate base]/[acid] ≤ 10