NOSIPHO ZUMA
A00018164
BIO 120
DR HAYATU RAJI
LAB 1: PH TEST FOR VARIOUS SUBSTANCES
LAB PARTNERS: AMINA SULEIMAN, SEDOO ORJE-ISHEGH
DATE: 27 SEPTEMBER 2016
Abstract
The primary purpose of this experiment was to determine pH levels of various substances using different methods. Two techniques were used, the pH paper indicator and the pH meter. Out of ten substances that were used, five of them were found to be acidic, namely: hydrochloric acid, coke, toothpaste, milk, and acetic acid. Sodium hydroxide, buffer solution, bleach, and the detergent were found to be basic. Bottle water was found to be neutral. Substances are said to be acidic because of having pH levels lesser than 7, and those having pH greater than 7 are said to be basic. Some are neutral, …show more content…
• The resulting color changes were compared to the pH scale and the results were recorded
• This procedure was repeated for the remaining substances. pH meter technique
• The pH meter was standardized by using a buffer solution with a pHof 7
• The pH sensor was dipped inside the contain labeled 3
• The pH meter was allowed to measure the pH of the substance until it stabilized, then the results were recorded
• The tip of the pH sensor was rinsed with distilled water
• The procedure was repeated for the remaining substances.
Results
Substances Data from the pH paper indicator Data from the pH meter
0.1M HCl 0 1.54
0.5M HCl 0 0.46
0.1M NaOH 14 12.60
0.5M NaOH 14 13.14
Coke 2 2.54
Toothpaste 8 6.54
Milk 8 6.40
Bottle water 7 7.5
Acetic acid 1 0.10
Buffer solution 8 8.55
Bleach Results not found 12.82
Detergent 12 10.61
A00018164
BIO 120
DR HAYATU RAJI
LAB 1: PH TEST FOR VARIOUS SUBSTANCES
LAB PARTNERS: AMINA SULEIMAN, SEDOO ORJE-ISHEGH
DATE: 27 SEPTEMBER 2016
Abstract
The primary purpose of this experiment was to determine pH levels of various substances using different methods. Two techniques were used, the pH paper indicator and the pH meter. Out of ten substances that were used, five of them were found to be acidic, namely: hydrochloric acid, coke, toothpaste, milk, and acetic acid. Sodium hydroxide, buffer solution, bleach, and the detergent were found to be basic. Bottle water was found to be neutral. Substances are said to be acidic because of having pH levels lesser than 7, and those having pH greater than 7 are said to be basic. Some are neutral, …show more content…
• The resulting color changes were compared to the pH scale and the results were recorded
• This procedure was repeated for the remaining substances. pH meter technique
• The pH meter was standardized by using a buffer solution with a pHof 7
• The pH sensor was dipped inside the contain labeled 3
• The pH meter was allowed to measure the pH of the substance until it stabilized, then the results were recorded
• The tip of the pH sensor was rinsed with distilled water
• The procedure was repeated for the remaining substances.
Results
Substances Data from the pH paper indicator Data from the pH meter
0.1M HCl 0 1.54
0.5M HCl 0 0.46
0.1M NaOH 14 12.60
0.5M NaOH 14 13.14
Coke 2 2.54
Toothpaste 8 6.54
Milk 8 6.40
Bottle water 7 7.5
Acetic acid 1 0.10
Buffer solution 8 8.55
Bleach Results not found 12.82
Detergent 12 10.61