Question 19
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 tested substances are acids, including lemon juice. How do you know these substances are acids? Complete this sentence.
Like the lemon juice, they turned ___ 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 tested substances are acids, including lemon juice. How do you know these substances are acids? Complete this sentence.
Like the lemon juice, they turned ___ litmus paper ___.
