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Most people are familiar with pH as an indicator of how acid or alkaline a solution is. The pH scale ranges from 0 pH (very acidic) to 14 pH (highly alkaline).

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Introduction

Most people are familiar with pH as an indicator of how acid or alkaline a solution is. The pH scale ranges from 0 pH (very acidic) to 14 pH (highly alkaline). Pure water, at 7 pH, is neutral--neither acidic nor alkaline. Maintaining proper pH is critical, whether growing in soil or hydroponically. Plants absorb each nutrient element only within a certain pH range, and because this range is different for different nutrients, there is only a relatively small pH range in which all nutrients are available. Strips used: (pH 5 - 10). These indicate pH to the nearest 0.5 units. A pH meter gives greater precision but pH strips are adequate and easy to use, not to mention, strips can be used only once. ...read more.

Middle

7) Press the STD button again. After the reading is stable, the meter will return to the Measure screen. Press the STD button again to calibrate with a second buffer solution 8) Remove the solution from the pH 4 buffer and rinse the electrode. Emerse the electrode in the pH 10 buffer and swirl. 9) Press STD again to calibrate with this buffer. The meter will display a calibration slope and return to the Measure screen. Now the meter sis calibrated and ready to use for measuring the pH of any solution. This is my method of setting up and calibrating a pH meter. 1. Open Calibration program on the computer. Sensing science laboratory. (Science Configuration) ...read more.

Conclusion

Calibrating the digital pH meter could have caused misconduct to the readings of my solution. As I can tell you that the beaker I used was already in contact with another human creature before I used it. Meaning to say that bacteria or any other impurities of any kind may have been left behind in the beaker and due to my account could have not been cleaned out properly. Results The PHS we measured were on tap water. Our first result was; 7.62 Second result; 7.52 Third result, 7.38 A reason why these results varied slightly could have been due to the impurities in the beaker and chloride in the tap water. This was probably because each time we tested the tap water the beaker was washed out, without doing this the beaker could have contained impurities causing the slight difference in the Ph. Saboor Shafique 11H ...read more.

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