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Ph Measurement Lab Conclusion Essay

Lab Report Acid Base Titration

1338 WordsOct 21st, 20126 Pages


Objectives: 1. To determine the concentration of acid using titration. 2. Skills of titration techniques.

Apparatus: 1. 250 volumetric flask 2. 10mL measuring cylinder 3. 25mL pipette 4. 50mL burette 5. 250mL beaker 6. 150mL conical flask 7. Retord stand 8. White tile 9. Stopwatch 10. Pipette bulb

Chemicals: 1. HCl solution 2. 0.1M NaOH solution 3. H2SO4 solution 4. Distilled water 5. phenolphthalein

An acid-base titration is the determination of the concentration of an acid or base by exactly neutralizing the acid/base with an acid or base of known concentration. This allows for quantitative analysis of the…show more content…

In addition to the sample, an appropriate indicator is added to the titration chamber, reflecting the pH range of the equivalence point. The acid-base indicator indicates the endpoint of the titration by changing colour. The endpoint and the equivalence point are not exactly the same because the equivalence point is determined by the stoichiometry of the reaction while the endpoint is just the colour change from the indicator. Thus, a careful selection of the indicator will reduce the indicator error. For example, if the equivalence point is at a pH of 8.4, then the Phenolphthalein indicator would be used instead of Alizarin Yellow because phenolphthalein would reduce the indicator error. Common indicators, their colours, and the pH range in which they change colour are given in the table above.[14] When more precise results are required, or when the reagents are a weak acid and a weak base, a pH meter or a conductance meter are used.

Procedure. 1. 10 mL of HX is put in a volumetric flask and is diluted with distilled water and mixed through in 100mL volumetric flask. The solution is transferred into a beaker and labelled as HX. 2. The burette is rinsed with 10mL of 0.1M NaOH aqueous solution and is filled with base. 3. 25mL of HX solution is transferred into a conical flask and 2 drops of phenolphthalein are added. 4. Begin to run the base

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Ph Lab Report

1683 WordsOct 22nd, 20117 Pages

The different methods of measuring acids and bases in a solution
By Starsky
Intro to Biology
September 26, 2011 Lab Partners: Kristen, Tania and Betty Introduction

When using different methods to measure pH levels there are some tools that can be useful. Some more than others but by putting into action the different methods it may determine which tools will work best and give the best results when testing the pH within a solution. The pH, which stands for the proportion of hydrogen ions in a solution, could be acidic (acidosis), neutral or basic (alkaline). The pH scale goes from numbers 1 through 14. A pH of 7 is neutral;…show more content…

By using the pH paper to measure the solutions A through E it would point out what substance is an acid and which one was basic. Also, by adding Bromothymol blue and Phenolphthalein afterwards to the solution it would indicate what color it would turn to when mixed into an acid and a base.
Pastel green

Very Pale Pink
Acid/Base/Neutral pH Reading
Color of Extract

Light Pink


Light green

Table 2: Consists of color extract taken from a red cabbage for a natural indicator. The pH reading that was measured by using the pH meter and the result of the pH reading to determine whether the solution was acidic or basic. By first measuring the pH levels of solution A through E with a pH meter, it gives a numeric reading to ph balance to a solution. Next, add in a natural indicator called anthocyanin made from the pigment from a red cabbage into each solution and mixed it until there is a distinct color and recorded on the chart. Finally, by looking at the result of the pH reading level that

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