P4: PH

P4. PH

1.INTRODUCTION

The ph is a measure of the acidity or basity of a solution. Solutions with a pH less than 7 are to be acidic and solutions with a pH greater than 7 are basic or alkaline. Pure water has a pH close to 7, neutral.
The pH is defined as the following equation;

pH= -log(H·)

For mesuring the pH of a solution at the lab we have different pH indicators:

- Universal indicador paper: It's an absorbent paper that has been impregnated with universal indicator. This method consists as a continuous color change from about pH 2 to pH 10.

- pH-meter: Is an electronic device used for measuring the exact pH of a solution. It consists of a glass electrode meter the measures and displays de pH reading.

2. MATERIAL

- Distilled water

- Milk

- Wine

- Lemon

- Tomato

- Coffe

- Carbonated beverage

- 10% NAOH solution 

- 10% HCl solution 

- NH3 solution

- Soap solution

- Universal indicator paper (strips)

- pH-meter

- Acetic acid

- Tongs
- 8 X 100 mL Beaker
- 5 test tubes
- Test tubes rack
- 10 mL pipel
- Funnel
- Graduated cylinder

3. PROCEDUCE

First of all, we took three beakers and three glasses clock. 
Squeeze the lemon and tomato and put ens their respective beakers. 
We took a piece of indicator paper and put it in the solution for 20 seconds. when removing the strip we saw that each had a different color. I compared it with a flag color according to the color and had a basic or acid concentration. After of all, we squeeze the rest of the lemon inside a beaker and filter the solution with a funnel and cellulose paper.

4. RESULTS OR OBSERVATIONS

The test tube with the highest concentration has a higher acidity wich has less concentracion