Question

У пробірки налийте по 1–2 мл наявних розчинів солей. До кожної пробірки додайте індикатор і визначте pH розчинів, використовуючи еталонну шкалу. Установіть, у яких випадках відбувається гідроліз солі, запишіть рівняння в молекулярній та йонно-молекулярній формах.

Answer 1

Experiment with Salt Solutions and pH Determination

To conduct the experiment, follow these steps:

1. Prepare Test Tubes: Pour 1-2 ml of the given salt solutions into separate test tubes. 2. Add Indicator: Add an indicator to each test tube to determine the pH of the solutions using a standard scale. 3. Identify Hydrolysis: Determine the cases in which salt hydrolysis occurs and record the molecular and ion-molecular equations.

Salt Solutions and pH Determination

Salt solutions can exhibit different pH levels based on their chemical properties and interactions with water. The pH of a solution indicates its acidity or basicity.

pH Determination

The pH of a solution can be determined using indicators that change color based on the hydrogen ion concentration. Common indicators include litmus, phenolphthalein, and universal indicator.

Salt Hydrolysis

Salt hydrolysis occurs when the ions of a salt react with water to produce either acidic or basic solutions. The type of hydrolysis depends on the nature of the ions in the salt.

Examples of Salt Hydrolysis Equations

- Molecular Form: The molecular equation represents the overall chemical reaction without considering the ionic nature of the compounds involved. - Ion-Molecular Form: The ion-molecular equation takes into account the dissociation of ions in the solution.

Conclusion

By conducting this experiment and analyzing the pH levels of different salt solutions, you can observe the phenomenon of salt hydrolysis and determine the corresponding molecular and ion-molecular equations for the reactions.

Remember to handle chemicals and laboratory equipment with care and follow appropriate safety protocols during the experiment.