# Chemistry

posted by .

What must be the molarity of an aqueous solution of trimethylamine, (CH3)3 N, if it has a PH=11.20?

• Chemistry -

Convert pH to pOH (pH + pOH = pKw = 14), then convert pOH to (OH^-) by pOH = -log(OH^-), then,
.....(CH3)3N + HOH ==> (CH3)3NH^+ + OH^-
equil...x................OH..........OH
where OH is the concn you found for OH^- above.
Kb = [(CH3)3NH^+][OH^-]/[(CH3)3N]
Substitute and solve for the denominator.

• Chemistry -

0.19M

## Similar Questions

1. ### Chemistry

A solution of hexane in the solvent (CH3)2CO has a mole fraction of CH3(CH2)4CH3 of 0.114. What mass (g) of the solution must be taken if 1690 g of hexane is needed?
2. ### chemistry

1.) What must be the molarity of an aqueous solution of trimethylamine (CH3)3N if it has a Ph of 11.04?
3. ### science

25 ml sample of 0.150 m solution of aqueous trimethylamine is titrated with 0.100 M soultion of hcl. calculate the pH of the solution after 10.0ml,20 ml and 30.0 ml of acid have been added; pkb of (CH3)3 N =4.19?
4. ### Chemistry

It is difficult to type these but I'll do my best. This is the first question and I just don't get it. My professor is out of the country so any help would be appreciated. Give the IUPAC name for each of the following alkanes: CH3 …
5. ### Chemistry

I would appeciate any help with identifying the chiral carbons, if any, in each of the following compounds: OCH3 2. CH3--CH--CH3 OH O 11. CH3--CH--C--CH3 OH 12. CH3--C--CH3 OH CH3 O 15.CH3--CH--C--CH3 Br CH3--C--CH2--CH3 OH thank you.
6. ### Chemistry

a 25.0mL sample of a 0.100M solution of aqueous trimethylamine is titrated with a 0.125M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pKb of (ch3)3N=4.19