Question

Просмотри видео и дополни предложения. Соляная кислота имеет среду. Когда на индикатор универсальный нанесли несколько капель соляной кислоты, цвет изменяется на . После добавления первой порции гидроксида натрия среда раствора стала . Это подтверждает показание индикатора, который изменяет свою окраску на . Следовательно, полная нейтрализация. Затем опять добавили гидроксида натрия и pH показывает значение равное . Это означает, что среда раствора и кислота полностью .

Answer 1

Ответ:

кислотную, красный, щелочной, оранжевый, не произошла, 7, нейтральная, нейтрализована

Объяснение:

Answer 2

The Effect of Hydrochloric Acid and Sodium Hydroxide on Universal Indicator

When hydrochloric acid is added to universal indicator, the color of the indicator changes to red or pink. This indicates that the hydrochloric acid is acidic in nature. The acidic nature of hydrochloric acid is due to the presence of hydrogen ions (H+) in the solution.

After adding the first portion of sodium hydroxide to the solution, the pH of the solution increases and the color of the universal indicator changes to purple or blue. This indicates that the solution has become more basic or alkaline. The increase in pH is a result of the reaction between the hydroxide ions (OH-) from sodium hydroxide and the hydrogen ions (H+) from hydrochloric acid. This reaction is known as neutralization.

The change in color of the universal indicator confirms the change in the pH of the solution. Universal indicator is a mixture of several different indicators that change color at different pH levels. The specific color change depends on the concentration of hydrogen ions (H+) or hydroxide ions (OH-) in the solution.

Therefore, the initial color change to red or pink indicates the presence of an acidic solution (hydrochloric acid), the subsequent color change to purple or blue indicates the presence of a basic solution (after neutralization with sodium hydroxide), and the final pH value of 7 after adding more sodium hydroxide indicates that the solution is neutralized and both the acid and base have reacted completely.

Please note that the information provided above is based on general knowledge about the behavior of hydrochloric acid and sodium hydroxide with universal indicator.