Water Analysis

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An Introduction to Water Analysis
February 1 and February 8 2011

Aim and Objective:

The aim of this experiment was to determine the pH level of an unknown HCl solution. While doing so, we would also be receiving a good and fundamental understanding of how to use modern lab equipment to determine the chemical and physical properties of water bodies.

Method:

Make sure safety gear is always on and equipment is always clean.

Part 1- Direct Analysis by pH Test Kit

We grab a 50ml beaker and obtain a sample of unknown HCl as said to do in the procedure section in page 3. A pH test kit was provided to us were we had to find the pH level of the HCl by adding a few drops of a chemical into our solution. After a few seconds we would compare the color that the HCl turned into against a strip provided to us in the kit. This procedure was only performed once and came to the final result that our unknown HCl had the pH level of 4. Once we were done with all the equipment we would clean it all off with distilled water three times.

Part 2-Direct Analysis by pH Meter

We grab a 50mL beaker that obtains samples of the unknown HCl solution and two beakers one with pH4 and the other with pH7 buffers needed to adjust the meter and electrode. Remember to clearly mark all of the beakers in order to not get the solutions mixed up. Obtain a Hanna 8014 pH meter and electrode like said to do so on page 4 under procedures. If a protective cap is over the end of the electrode REMEMBER to remove it. Okay so before the pH meter can be used it has to be calibrated. The way to calibrate it is by placing the 50mL beaker of pH7 onto the magnetic stirrer, add a stir bar and start to gently stir. Using the stand and clamp insert the thermometer into the center of the buffer solution making sure that the bulb is completely in the solution and not touching any part of the beaker. Carefully remove the cap from the electrode and rinse with distilled water. Using another clamp

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