Ex. 1 Read and translate the text.
How I have obtained demineralized water
My name is Chris. I am a teacher of chemistry. I have just finished my laboratory work. My laboratory work was about how to obtain demineralized water. In order to obtain demineralized water I used ionite filter. I passed tap water through cationite which linked cations. As a result I obtained the water which had acid medium. Then I passed this water through anionite which linked anions. The water which I passed through both ionites was demineralized water. The water which I have obtained isn’t inferior to distilled water by quality.
However my friend Aleck has obtained demineralized water with the help of the laboratory setup. He built this setup by himself. His setup consisted of two columns. These columns were quartz. The height of columns was 70 cm and their diameter was 5 cm. He placed 550 grams of ion exchange resins in the columns. In one column he placed anionite. In other column he placed cationite. He passed water through cationite. Then he directed it into the column with anionite. He sampled water using three-way tap. After that he titrated it by NaOH solution.
Ex.2 Answer the following questions.
1. What did Chris want to obtain?
2. What medium did the water which Chris obtained have ?
3. What filters did Chris use?
4. Who is Alec?
5. How did Alec sample the water?
Ex.3 Put the verbs in Present Perfect.
1. Fanny (to do) ___ just a very interesting experiment.
2. I (to prepare) ____ the solution.
3. I (not to sample) ___ water yet.
4. (to titrate) you the solution yet ?
5. I (to wash) already all dishes.
6. I (to use) tap water in this experiment.
7. She (to place) 50 grams of cationite.
Ex.4 Put the questions to the bold-typed words.
1. Chris has measured the temperature.
2. He has titrated NaOH solution.
3. I haven’t used three-way tap.
4. She has passed water through anionite.
5. Cationite has linked cations.
6. I have placed 50 grams of this substance into the flask.
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