10. pts When Erams ofan unknown monoprotic acid are dissolved in waler. 22.63 m

Question

10. pts When Erams ofan unknown monoprotic acid are dissolved in waler. 22.63 m .00 M NaOH (aq) are required to reach the equivalence point. Which of the following is most likely the unknown acid? A) Chloroacetic acid, CH CICOOH B) Dichloroacetic acid, CHC1.COOH C) Benzoic acid C HsCOOH D) Trichloroacetic acid, CCI,COOH E) None of these 11.00 pts) Suppose you mix Kl (aq) with PtoNO,, (aq) such that the initial concentrations of (aq) and Pb (aq) are II lo 15 x 10 M and IPb "lo 7.5 x 10' M. respectively. Which of the following statements is true if K 98 x 10 M3 for Pblr (s)? A) Pbl2 s) will precipitate because K. B) Pbl2(s) will precipitate because Qr C) Pbl. (s) will not precipitate because Qv>K, D) Pblz (s) will not precipitate because Qr

Explanation / Answer

For the first question, use the following expression:

MaVa = MbVb

and MaVa = moles of a (na),

na = ma/MMa

So:

ma/MMa = MbVb   So solving for MMa we can actually know which compound is:

2.14 / 1 * 0.02263 = MMa

MMa = 94.56 g/mol

This MM corresponds to an acid with a very low weight. The only acid with this MM is from option a). This is the correct answer.

For the second question, post it in a new thread so you can be better answered.

Hope this helps

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