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xeniaverner
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Раскройте скобки и употребите глаголы в Present Continuous, Present Simple, Present Perfect, Past Simple, Past Continuous.
11. I (think) about starting a new project.
12. I (finish) my painting. Have a look at it!
13. The man (get) into his car and (drive) down the street.
14. The television (be) on at this time yesterday, but we (not watch).
15. I (think) he is a good person.
16. I (not be) very busy, I (have) nothing to do.
17. Allen (sleep) when his friends (watch) a film.
18. He will come if you (invite) him.
19. What you (look) for? – I (look) for my pen.
20. The girl (read) books all day yesterday.

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kingoflfmvd
kingoflfmvd
4,5(18 оценок)

buffer solutions, depending on their composition, are divided into 2 main types:

acidic and basic.

acid buffering systems are usually formed by a weak inorganic or

organic acid and a salt of the same acid with a strong base.

for example:

1) ch3cooh + ch3coona - acetate buffer

weak acid salt acid

2) h2co3 (h2o + co2) + nahco3 - hydrocarbonate or

weak acid salt acid bicarbonate buffer.

basic buffer systems are formed by weak inorganic or

organic base and a salt of this base with a strong acid. for example:

1) nh3 · h2o (nh4oh) + nh4cl - ammonia buffer

weak base salt

2) c2h5 – nh2 + c2h5nh3cl - ethylamine buffer

weak base salt

basic buffer systems are formed by weak inorganic or

organic base and a salt of this base with a strong acid. for example:

1) nh3 · h2o (nh4oh) + nh4cl - ammonia buffer

weak base salt

2) c2h5 – nh2 + c2h5nh3cl - ethylamine buffer

weak base salt.

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