Question

In: Chemistry

A 35. mL of a 0.045 M solution of acetic acid, pKa = 4.74, is titrated...

A 35. mL of a 0.045 M solution of acetic acid, pKa = 4.74, is titrated with a 0.068 M solution of NaOH. What is the hydroxide ion concentration of the resulting solution after 30.0 mL of NaOH is added?

Solutions

Expert Solution

       no of moles of CH3COOH   = molarity * volume in L

                                                    = 0.045*0.035    = 0.001575 moles

     no of moles of NaOH            = molarity * volume in L

                                                   = 0.068*0.03   = 0.00204 moles

no of moles of excess NaOH     = 0.00204-0.001575    = 0.000465 moles

total volume                                = 35+30 = 65ml = 0.065L

molarity of NaOH excess        = no of moles/total volume

                                                = 0.000465/0.065   = 0.00715M

     NaOH -----------------> Na^+    + OH^-

0.00715M                                       0.00715M

[OH^-]     = 0.00715 M >>>>answer


Related Solutions

A 10.00 mL portion of a solution of acetic acid (pKa = 4.7) is titrated against...
A 10.00 mL portion of a solution of acetic acid (pKa = 4.7) is titrated against a standardized solution of 0.200 M NaOH. The equivalence point is observed after 30.00 mL of base have been added. After which total volume of added base will the pH be closest to 4.7? A. 0.00 mL b. 5.00 mL c. 10.00 mL d. 15.00 mL e. 20.00 mL f. 30.00 mL -Please explain, Thank you.
A 25.0 mL sample of a 0.110 M solution of acetic acid is titrated with a...
A 25.0 mL sample of a 0.110 M solution of acetic acid is titrated with a 0.138 M solution of NaOH. Calculate the pH of the titration mixture after 10.0, 20.0, and 30.0 mL of base have been added. The Ka for acetic acid is 1.76x10^-5.
a 25.0 mL solution if 0.10 M acetic acid is titrated with 0.1 M NaOH solution....
a 25.0 mL solution if 0.10 M acetic acid is titrated with 0.1 M NaOH solution. the pH equivalence is
A 25.0-mL solution of 0.100 M acetic acid is titrated with a 0.200 M KOH solution....
A 25.0-mL solution of 0.100 M acetic acid is titrated with a 0.200 M KOH solution. Calculate the pH after the following additions of the KOH solution: a) 0.0 mL b) 5.0 mL c) 10.0 mL d) 12.5 mL e) 15.0 mL
A 49.2 mL sample of a 0.537 M aqueous acetic acid solution is titrated with a...
A 49.2 mL sample of a 0.537 M aqueous acetic acid solution is titrated with a 0.415 M aqueous solution of sodium hydroxide. How many milliliters of sodium hydroxide must be added to reach a pH of 4.502? ?mL​
a 22.5 ml sample of an acetic acid solution is titrated with a 0.175 M NaOH...
a 22.5 ml sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 37.5 ml of the base is added. What was the concentration of acetic acid in the original 22.5 ml? what is the ph of the equivalence point? (ka (acetic acid) = 1.75 x 10^-5)
Acetic acid is a monoprotic weak acid with a pKa of 4.74. (Ka = 1.8 x...
Acetic acid is a monoprotic weak acid with a pKa of 4.74. (Ka = 1.8 x 10-5) (a) What is the pH of 5 mL of a 5.0% solution? (b) What is the pH of the solution if you now add 45 ml of water to solution (a)? How will the equivalence point volumes differ if you titrate the two solutions ?
a) Calculate the pH of a 0.045 M potassium chlorite solution. (The pKa for chlorous acid...
a) Calculate the pH of a 0.045 M potassium chlorite solution. (The pKa for chlorous acid is 1.92) b) Calculate the pH of a solution that is 0.35 M hydroxylamine and 0.50 M hydroxylammonium chloride, (The pKb for hydroxylamine is 7.96)
When a 23.1 mL sample of a 0.427 M aqueous acetic acid solution is titrated with...
When a 23.1 mL sample of a 0.427 M aqueous acetic acid solution is titrated with a 0.415 M aqueous potassium hydroxide solution, (1) What is the pH at the midpoint in the titration? (2) What is the pH at the equivalence point of the titration? (3) What is the pH after 35.7 mL of potassium hydroxide have been added?
A) When a 25.1 mL sample of a 0.434 M aqueous acetic acid solution is titrated...
A) When a 25.1 mL sample of a 0.434 M aqueous acetic acid solution is titrated with a 0.320 M aqueous sodium hydroxide solution, what is the pH after 51.1 mL of sodium hydroxide have been added? pH = B) When a 17.5 mL sample of a 0.492 M aqueous nitrous acid solution is titrated with a 0.451 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration? pH =
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT