Purchase Solution

Titration of 50 mL 0.108 M propanoic acid (HPr) with 0.150 M NaOH

Not what you're looking for?

Ask Custom Question

A sample of 0.0054 mol propanoic acid was dissolved in water to give 50ml solution. This solution is titrated with 0.150 M of NaOH. Draw the expected titration curve labeling the equivalence point (including the volume of NaOH added and the pH) and show the pKa point (labeling the pH value and volume of NaOH added)

Purchase this Solution
Solution Summary

This answer provides a full solution to the question. As well, it provides an example for understanding weak acid-strong base titration cases, an illustration of a titration curve demonstrating this and outlines why understanding this case may help solve the problem. 500 words.

Solution Preview

Titration of 50 mL 0.108 M propanoic acid (HPr) with 0.150 M NaOH

Calculate the pH at any stage of the titration:
a) Original solution of HPr
HPr (aq) = H+ (aq) + Pr (aq)
[init] 0.108 M 0 0
[change] -x +x +x
[equil] (0.108-x) x x

Ka = x^2/(0.108 -x)

x = = 1.22 x 10^-3 M = [H3O+]

So pH = 2.91

In the buffer region (see graph) at the pKa point, pKa = pH, because [Hpr] = [Pr^-]
Volume of NaOH added at pH=4.86 can be read from the graph if plotted properly.
Use Henderson-Hasselbalch equation and you don't have to calculate new [HPr] and [Pr ]; can use ratio of n(HPr) and n(Pr ).
pH = pKa + log [Pr-]/[HPr]
Vf's cancel pH = pKa + log (moles ...

Purchase this Solution
Free BrainMass Quizzes
Periodic table

Organic Chemistry Naming: Alkanes

This is a quiz which is designed to assist students with learning the nomenclature used to identify organic compounds. This quiz focuses on the organic compounds called Alkanes.

General Chemistry - Classification of Matter

This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.

Functional groups in Organic Chemistry

You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.

Match Elements with their Symbols

Elements are provided: choose the matching one- or two-letter symbol for each element.

View More Free Quizzes
Related BrainMass Solutions

  • titration of benzoic acid with NaOH

    A 25.0 ml sample of an aqueous solution of pure benzoic acid is titrated using standardized 0.150 M NaOH A) After addition of 15.0ml of the 0.150 M NaOH , the pH of the resulting solution is 4.37.

  • Quantum Titration Problems

    Assume sulfuric acid dissociates completely (i.e. it is a strong acid). Consider the titration of 25.00 mL of a solution that contains 0.0450 M I- by a 0.150 M solution of Cu+ to form the precipitate CuI.

  • Concentration of an Acid after Titration

    * You required 200 mL of the base solution. * 0.50 M NaOH contains 0.50 M NaOH in 1000 mL of solution. * You needed 200 mL so you get: 200 mL contains = 0.50 / 5 that is 0.1 M NaOH * So, in 50 mL HCl solution were 0.1 mol HCl.

  • Lab Titration for NaOH

    438320 Lab Titration for NaOH For your most exact titration, record the following: (a) Volume of NaOH solution in the burette at the start (mL): The volume of NaOH solution in the burette at the start was 50 mL.

  • pH during titration prcoess

    105567 pH during titration prcoess Calculate Titration. See attached file for full problem description. 19. Calculate the pH at 0, 10.0, 25.0, 50.0, and 60.0 mL of titrant in the titration of 25.0 mL of 0.200 M HA with 0.100 M NaOH.

  • Titration Curve of Weak Acid with Strong Base

    245959 Titration Curve of a Weak Acid with a Strong Base A 30 mL sample of 0.35 M of lactic acid is titrated with a 0.25 M NaOH solution. Calculate the pH before NaOH is added. After 20 mL of NaOH is added. After 42 mL. After 45 mL. After 60 mL.

  • acid base titration

    What is the molarity of the base solution? 18. Calculate the pH at 0, 10.0, 25.0, and 30.0 mL of titrant in the titration of 50.0 mL of 0.100 M NaoH with 0.200 M HCl. Please see the attached file. 13.

  • Solutions, Precipitations, and Balancing Equations

    4 - If acetic acid is being stored as a 6M solution, how many ml would you need to make up 200 ml of a 0.17 M solution ? 5 - What mass of aluminum hydroxide can be made from 50 ml of 0.25M Al(NO3)3 and 100 ml of 0.1 M KOH?

  • Titration: Sulfuric Acid

    61351 Titration: Sulfuric Acid You are going to titrate sulfurous acid, H2SO3 (Ka1 = 1.7x 10minus 2 and Ka2 = 6.4 x 10 minus 8) with a 0.2000 M NaOH solution. If you start with 100 ml of 0.1275 M sulfurous acid, what is the initial pH?

View More Related Solutions