6.03 Ph Lab

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The purpose of this experiment is to determine the pH of known substances by use of a pH color indicator of red cabbage and the use of a pH meter. As well as, to observe the pH changes in a substance by adding in more basic of acidic to buffered solutions and unbuffered solutions. This experiment will also will show how to calculate H3O+, OH- and pH by use of known values.
In order to do this lab, there are a few key components one needs to know and understand first. A solution is a homogeneous mixture of elements that are dissolved in water making it an aqueous solution. Solutions can form an acid, which is a substance that dissolves in water and gives a hydrogen ion, or proton (H+), to the water. It can also form a base, which is a substance that dissolves in water and
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Re-pour the known solutions into 12 new test tubes and use the pH meter to find the value. To use the pH meter turn on the device and place the probe into the substance, wait for the value to become stable and record. Identify if the 12 know substances are acidic, basic, or neutral.

The experiment C effect of buffers on pH can be done using the red cabbage indicator or the pH meter. Start off by adding 10mL of H2O, 0.1 M NaCl, buffer with a high pH, and buffer with a low pH to separate test tubes. Pour 2mL of the red cabbage indicator to 4 test tubes or the use of a pH meter and record the value. Start by adding and measuring 5 drops of 0.1 M HCl solutions to each of the 4 test tubes from part one and mix. Find the value and record. Add 5 more drops of the HCl to each test tube from part 2 and mix. Record the value of the pH. Find the pH change in each solution and record. Find which solutions has a buffer and record.
C.2 effects of adding base can be done using the red cabbage indicator or the pH meter. Start off by adding 10mL of H2O, 0.1 M NaCl, buffer with a high pH, and buffer with a low pH to separate test

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