Question 20
Materials: Safety goggles; gloves; eight beakers with 10 cm³ of each of these substances: distilled water, lemon juice, vinegar, liquid soap, fizzy drink (such as cola), dilute bleach, dilute hydrochloric acid, sodium hydroxide solution; red litmus paper; blue litmus paper.
1. Work in pairs. Put on your safety goggles and gloves.
2. Dip a strip of blue litmus paper into each substance. Then, dip a strip of red litmus paper into the same substance. Use a different strip for each substance.
Caution: Wipe up spills as soon as they happen. If any substance spills on your hands, replace your gloves with a clean pair. Wash your hands after doing this activity.
Some of the substances you tested were alkalis. Which of the substances are alkalis?
1. Work in pairs. Put on your safety goggles and gloves.
2. Dip a strip of blue litmus paper into each substance. Then, dip a strip of red litmus paper into the same substance. Use a different strip for each substance.
Caution: Wipe up spills as soon as they happen. If any substance spills on your hands, replace your gloves with a clean pair. Wash your hands after doing this activity.
Some of the substances you tested were alkalis. Which of the substances are alkalis?
