Chemistry, 23.06.2019 03:40 ElegantEmerald
The following questions a24 - a26 relate to 100 ml of 0.0150 m solution of benzoic acid (c6h3cooh). ka(c6h3cooh) = 6.4 x 10^-5. what is the ph of the solution after the addition of 1 x 10^-3 moles of naoh? you may assume no volume change to the solution upon addition of the naoh.
Answers: 2
be 
. Note that 
.
![\displaystyle \frac{[\mathrm{C_6H_5COO^{-}}]\cdot [\mathrm{H^{+}}]}{[\mathrm{C_6H_5COOH}]} = \mathrm{pK}_{a}](/tpl/images/0006/5046/265ec.png)
.
.
:
.
.
.![\rm [H^{+}] = 0.00306655\; mol\cdot L^{-1}](/tpl/images/0006/5046/db736.png)
.![\displaystyle \mathrm{pH} = -\log_{10}{[\mathrm{H^{+}}]} = 2.513](/tpl/images/0006/5046/141cf.png)
.
. Benzoic acid is thus a monoprotic acid. Each mole of the acid will react with only one mole of 
. The 100 mL solution initially contains 
moles of benzoic acid. The 
moles of 
(from the salt 
) and 
moles of 
.
and the conjugate base of the acid 
for benzoic acid.![\begin{aligned}\mathrm{pH} &= \mathrm{pK}_{a} + \log{\frac{{[\text{Conjugate Base}]}}{[\text{Weak Acid}]}} \\ &= \mathrm{pK}_{a} + \log{\frac{{[\mathrm{C_6H_5COO^{-}}]}}{[\mathrm{C_6H_5COOH}]}}\\ &= 4.19382 + \log{\frac{0.01}{0.005}}\\ &\approx 4.495 \end{aligned}](/tpl/images/0006/5046/20b2b.png)
.
Other questions on the subject: Chemistry
Chemistry, 22.06.2019 10:50, mi364
A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.
Answers: 3
Chemistry, 23.06.2019 06:50, isabellainksow87vn
The student repeated the experiment using a higher concentration of acid. the same volume of acid and the same mass of magnesium ribbon were used. what volume of hydrogen gas would have been produced after 60 seconds?
Answers: 1
Chemistry, 23.06.2019 07:30, klocke2001
Can you guys answer these questions i need it before 1: 00pm
Answers: 3
You know the right answer?
The following questions a24 - a26 relate to 100 ml of 0.0150 m solution of benzoic acid (c6h3cooh)....
Questions in other subjects:
Social Studies, 21.08.2019 20:30
