[Solved] Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C<sub>6</sub>H<sub>5</sub>CO<sub>2</sub>H)and 0.15M sodium benzoate (C<sub>6</sub>H<sub>5</sub>COONa).[K<sub>a</sub> = 6.5 × 10<sup>-5</sup> for benzoic acid] A)3.97 B)4.83 C)4.19 D)3.40 E)4.41 Testosterone Supplements: Products, often in the form of pills, injections, or gels, designed to increase testosterone levels in the body, used for medical reasons or to enhance physical performance or libido. Viagra: A medication used primarily in the treatment of erectile dysfunction, helping to increase blood flow to the penis to help a man get and keep an erection. Erectile Disorder: This refers to a type of sexual impairment where an individual cannot sustain or achieve penile erection during sexual engagement. Erotic Plasticity: Erotic plasticity refers to the degree to which an individual's sex drive can be changed by societal, situational, and cultural influences.