Homework Help: Chemistry

Posted by April on Friday, May 4, 2012 at 9:11am.

1. As the strength of a weak acid increases, the proportion of ions to molescules increases or decreases? ... I think that it will increase. Is this right?

2. As the as the concentration of a weak acid increases, the pH... decreases? Is decreases correct?

3. at the same concentration (molarity) a strong acid will have a higher/lower / the same pH as a weak acid. I think it is lower...Is this correct?

4. As the concentration of a weak base increases, the pH will increase/decrease/ remain constant? I think it will increase? Is this correct?

Chemistry - Phil, Friday, May 4, 2012 at 10:38am
1. You are correct. The strength of a weak acid is proportional to its dissociation constant, which is directly proportional to the concentration of ions and inversely proportional to the concentration of the undissociated acid molecules.

2. Yes, this is correct. The pH decreases because pH = -log([H+]). If the concentration of a weak acid goes up, the concentration of H+ will also go up. However, the negative sign in that expression means that the pH will go down.

3. Yes, that is correct. Lower pH means higher acidity/stronger acid.

4. Yup. Just as pH decreases with higher concentrations of acid, it will increase with higher concentrations of base.
Chemistry - josh bradley, Tuesday, May 8, 2012 at 2:07pm
idk what i am answering but the answer is B!!!

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