Titration

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor), nisitha, Jen Moreau and 1 other

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The Process

The process of titration is used to calculate the concentration of a solution by neutralizing it and doing some maths (all explained below).

the process of titration

1.png
Measure 10cm3 of acid using a pipette for accuracy. Then release it into the conical flask.
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Add a few drops of indicator (in this example, phenolphthalein) to the conical flask
3.png
Fill the burette to the top indicator with sodium hydroxide solution
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Put the conical flask on top of a white tile, this makes it easier to notice any color change. Open the burette so the NaOH slowly flows/drops into the conical flask.
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Swirl the conical flask. Toward the end, the solution turns pink, but when swirled, returns to colorless. Now add the NaOH dropwise. Now turn off the burette as soon as the pink doesn't disappear.
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Record the amount of NaOH used.
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Repeat the experiment to get concordant (the same) results.

Calculating Concentrations

Say that these were your results:

titrationresults.png

The most important thing to know when doing this calculation is this triangle, all further calculations are based on this.

triangle used to calculate concentration, moles or volume, with units

Now to continue, we need the balanced equation for this reaction

HCl + NaOH ==>> NaCl + H2O

From the reaction, we can see that for every 1 hydrochloric acid there is one sodium hydroxide, so their moles are the same. Given that we have the concentration and volume of HCl, we can work out the number of moles. It is divided by 0.01 since there are 1000 cm3 in 1 dm3.

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titrationcalc1.png

Now we have the moles of sodium hydroxide and also the volume we can work out the concentration.

titrationcalc2.png

Questions and Answers

In the estimation of calcium hardness of water, how to know the volume of EDTA(titrate) consumed from the salt weight 0r molarity of salt?

Without performing the titration experiment how to tell the volume of EDTA consumed from the salt weight. Just to know the answer before the experiment is done. I have tried: Do experiment several numbers of times lack of time not getting a proper result so I need to know the answer before the experiment is done. I think it was caused by Lack of time not getting a proper result so I need to know the answer before the experiment is done

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Example methods section for simple acid/base titrations?

Hi Jamie, I'm just digging around trying to find a scientific article with an example of the "Methods" section for a simple titration. Unfortunately, I can't find any suitable papers, only books. Any ideas to direct my search? Thanks, Sam

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Referencing this Article

If you need to reference this article in your work, you can copy-paste the following depending on your required format:

APA (American Psychological Association)
Titration. (2017). In ScienceAid. Retrieved Apr 29, 2017, from https://scienceaid.net/chemistry/applied/titration.html

MLA (Modern Language Association) "Titration." ScienceAid, scienceaid.net/chemistry/applied/titration.html Accessed 29 Apr 2017.

Chicago / Turabian ScienceAid.net. "Titration." Accessed Apr 29, 2017. https://scienceaid.net/chemistry/applied/titration.html.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.

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Article Info

Categories : Applied

Recent edits by: Jen Moreau, nisitha, Taylor (ScienceAid Editor)

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