Problem: Determine the pH of an HNO2 solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small?a. 0.500 Mb. 0.100 Mc. 0.0100 M

FREE Expert Solution

For the pH of each HNO2 solution:

Ka of HNO2 → 4.0x10-4

(1) Construct an ICE table (where y is the concentration of HNO2)

(2) Calculate the [H3O+] using Ka expression

Ka = [NO2-][H3O+][HNO2]4x10-4 = (x2)y-x

Inspecting each concentration of HNO2:

-x is negligible if HAKa >>500 0.54x10-4=1250; hence  -x is negligible0.14x10-4=250; hence  -x is NOT negligible0.014x10-4=25; hence  -x is NOT negligible

View Complete Written Solution
Problem Details

Determine the pH of an HNO2 solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small?
a. 0.500 M
b. 0.100 M
c. 0.0100 M

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Sra's class at UTD.