| Thread Closed |
Acid concentration Q's |
Share Thread |
| Jun14-04, 01:28 AM | #1 |
|
|
Acid concentration Q's
Heya's
Having some problems with the following question: Trimethylacetic acid [tex]C_4 H_{11} COOH[/tex]is a weak monoprotic acid. When 0.0010 mol of Trimethylacetic acid was dissolved in 100mL of water, the concentration of trimethylacetic ion was found to be [tex]3.0 \times 10^{ - 4} mol.L^{ - 1} [/tex] a) What is monoprotic acid? An Acid that donates only one proton. b) Use the above data to work out [tex]pK_a [/tex] for Trimethylacetic acid. now pKa = -log[Ka] think? How would I go about working Ka out? c) What volume of 0.2M KOH would be required to neutralise this solution of trimethylacetic acid? For this I would just work out how many moles are in the 100mL solution, and then use that to work out how how much volume of KOH I would need to add. However I'm unsure how to work out how many mols are in the 100mL solution, It's an easy units conversion problem im sure, but I suck at it :( |
| Jun14-04, 03:00 AM | #2 |
|
|
Look at the concentration of the ion.
If there's that much in the solution that exists as an ion, an equal amount must exist as H+. |
| Jun14-04, 09:31 AM | #3 |
|
|
[tex]Ka= \frac {[H^+][A^-]} {[HA]}[/tex]
and [tex] [H^+] = 10^{-7} + [A^-][/tex] |
| Thread Closed |
Similar discussions for: Acid concentration Q's
|
||||
| Thread | Forum | Replies | ||
| Finding out the concentration of an acid or base | Chemistry | 3 | ||
| Organic Chemistry: acid pKa of a substituted phthalic acid | Biology, Chemistry & Other Homework | 12 | ||
| calculating molecular mass of oxalic acid (diprotic acid) using only given #s? | Biology, Chemistry & Other Homework | 1 | ||
| titrating weak acid buffer with strong acid after the base is used up | Biology, Chemistry & Other Homework | 6 | ||
| Concentration Citric Acid in Lemon Juice? | Chemistry | 6 | ||