Examine limestone
Material: crystallization dish, rock sample, 25% vinegar essence
- Place the rock samples next to each other in a crystallization dish.
- Fill the glass with vinegar so that the stones are completely covered.
- What can you observe?
- Leave the stones in the solution for a week. What happens?
Dripstone formation
Material: two Erlenmeyer flasks (250 mL), two stirring fish, magnetic stirrer, two beakers (100 mL), cotton thread, watch glass, crystal soda, distilled water. water
- Dissolve 30 g crystal soda in 70 mL dist. water and divide the solution into two beakers.
- Soak a cotton thread in the solution. Then fix the ends of the thread into the filled beakers so that the middle hangs over a watch glass.
- Leave the construction overnight. What happens?
Lime-loving plants
Material: three watch glasses, diluted hydrochloric acid, table vinegar, 20% citric acid, saxifrage (Saxifraga Paniculata)
- Place three leaves of saxifrage on a watch glass.
- Carefully drip one of the acids onto each watch glass until the leaves are covered with the solution.
- What can you observe?
