Предмет: Химия, автор: sulhadinsulejmanov

Узнайте, 1. что такое Индикаторы 2. какие виды есть? 3. В каких средах на какой цвет они меняют свой окрас? 4. Опишите 3 вида среды: - кислотная - щелочная - нейтральная​

Ответы

Автор ответа: timaceshanlo
1

Ответ:Кислотно-осно́вные индикаторы (pH-индикаторы[1]) — органические соединения, способные изменять цвет в растворе при изменении кислотности (pH). Индикаторы широко используют в титровании в аналитической химии и биохимии. Их преимуществом является дешевизна, быстрота и наглядность исследования. Однако из-за субъективности определения цвета и невысокой точности индикаторы pH не всегда удобны; поэтому для точного измерения pH используют pH-метры с цифровой индикацией.

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1. Yesterday John was at home …
a) with his mother
b) with his father
c) with his mother and father
2. Yesterday John’s father said:
a) “Let’s cook dinner for Mum together”.
b) “Let’s do your homework together”.
c) “Let’s watch TV together”.
3. At first they decided to…
a) cook fish for dinner.
b) cook soup for lunch.
c) cook a pizza for dinner.
4. They started cooking fish and …
a) John went to his bedroom to read a book.
b) John went to his bedroom to watch TV.
c) John went to his bedroom to do his homework.
5. John’s mother was unhappy because…
a) John didn’t do his homework.
b) the kitchen was dirty.
c) John and his father cooked a pizza for dinner.
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