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# Lab Report-Determination of the Concentration of Hydrochloric Acid Solution

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Acid-Base Titrations
Chemistry Quick Review of an Acid-Base Titration Calculation
By Anne Marie Helmenstine, Ph.D., About.com Guide
* titration
* calculations
* study sheets
* acid-base reactions
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* Concentration Problem
An acid-base titration is a neutralization reaction that is performed in the lab in order to determine an unknown concentration of acid or base. The moles of acid will equal the moles of base at the equivalence point. Here's how to perform the calculation to find your unknown.
For example, if you are titrating hydrochloric acid with sodium hydroxide:
HCl + NaOH → NaCl + H2O
You can see from the equation there is a 1:1 molar ratio between HCl and NaOH. If you know that titrating 50.00 ml of an HCl solution requires 25.00 ml of 1.00 M NaOH, you can calculate the concentration of hydrochloric acid, [HCl]. Based on the molar ratio between HCl and NaOH you know that at the equivalence point:
moles HCl = moles NaOH
MHCl x volumeHCl = MNaOH x volumeNaOH
MHCl = MNaOH x volumeNaOH / volumeHCl
MHCl = 25.00 ml x 1.00 M / 50.00 ml
MHCl = 0.50 M HCl
Short Report Format
Title: Acid Base Titrations-the percentage of acetic acid in vinegar
By:
A. Student, #990001
dd/mm/yy

Lab Partner: M.Y. Partner

Purpose: To use a quantitative titration method to determine the % of acetic acid in vinegar. Also to learn the concept of neutralization, moles, dilution, and stoichiometry as it applies to titration data. This was accomplished by first determining what volume of standard hydrochloric acid (of known...

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