Sunday
March 29, 2015

Homework Help: chemistry

Posted by Sarah on Sunday, April 6, 2008 at 10:47pm.

Methanoic acid HCO2H(aq) also known as formic acid, is partly responsible for the characterisitic itchy rash produced by the leaves of the stinging nettle plant. Calculate the pH of 0.150 mol/L methanoic acid. The Ka for methanoic acid is 1.8 x 10^-4.

My Work:
Lets call Methanoic acid HL

HL--> H^+ plus L^-

Ka = (H+)(L-)/(HL) = 1.8 x 10^-4

HL --> H+ plus L-
I 0.150 0 0
C -x +x +x
E 0.150-x +x +x


Ka = (+x)(+x)/(0.150-x) = 1.8 x 10^-4
= (x^2) / (0.150-x) = 1.8 x 10^-4

Im having problems with the next step

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry - Methanoic acid HCO2H(aq) also known as formic acid, is partly ...
chemistry - Methanoic acid HCO2H(aq) also known as formic acid, is partly ...
Chemistry - (a) Explain what is meant by a weak acid. Methanoic acid (HCO2H) has...
Science - chemistry - Calculate the volume of 0.05 M NaOH which must be added to...
Science - chemistry - Calculate the pH of a solution prepared by adding 36 cm3 ...
Chemistry - Predict and balance the following organic reactions. 1. Ethanol(...
Chemistry - A 23.6 molar solution of formic acid (methanoic acid) has a density ...
Chemistry - 1. What is the name of the ester formed from formic acid and ...
Chemistry - A 2.28 m solution of the solute formic acid dissolved in the solvent...
Chemistry - Formic acid, HCO2H, is a weak acid. Write a net ionic equation for ...

Members