Ph Lab Report

1683 Words Oct 22nd, 2011 7 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;
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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.
Base
8.93
Pastel green
A

Neutral
7.14
Very Pale Pink
B
Acid/Base/Neutral pH Reading
Color of Extract
Solution

Acid
4.26
Light Pink
C

Acid
2.22
Pink
D

Base
10.05
Light green
E

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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