1. Match the following terms with their definitions:

analyte titrant endpoint indicator solution solute

__________ is a homogeneous mixture composed of two or more substances.

__________ is a substance that is dissolved in another substance, known as solvent. These two are present in a solution.

__________ is a solution of the substance whose concentration is unknown and sought in the analysis.

__________ is a solution in which the concentration of a solute is precisely known.

__________ is the point at which the titration is complete, as determined by an indicator.

__________ is a substance used to show the presence of a chemical substance by its color.

2. Translate the sentences into English without using a dictionary.

1 . Стандартный раствор — это раствор известной концентрации. 2. Во время титрования титрант прибавляют к раствору неизвестной концентрации для достижения точки эквивалентности. 3. Выбор индикатора может стать ключом к успешному титрованию. 4. В широком смысле титрование — это определение концентрации вещества в растворе. 5. Кислотно-основное титрование основано на реакции нейтрализации.

3. Read the following text about acid-base titration and unscramble the letters in the brackets to find the correct word. Translate the text.

A cid-base titrations are usually used to find the a________¹ (tamnuo) of a known acidic or basic substance through acid-base reactions. The a________² (lanatey) is the solution with an unknown m________³ (larmotiy). The titrant is the solution with a known molarity that will react with the analyte.

The analyte is prepared by dissolving the substance being studied into a s________⁴ (nosotiul). The solution is usually placed in a f________⁵ (skalf) for titration. A small amount of i________⁶ (candiroti) is then added into the flask along with the analyte. The reagent is usually placed in a b________⁷ (terubet) and slowly added to the analyte and indicator mixture. The amount of reagent used is recorded when the indicator causes a change in the color of the solution.

4. Rewrite the sentence so that it contains the word in capitals.

a I’m sure you know the difference between a solid and a gas! MUST

You must know the difference between a solid and a gas!________________________________

b If a substance does not contain hydrogen, then we are sure that it isn’t an acid. CAN’T

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c If we put some litmus paper in a solution and it turns red, then we are sure that the solution is an acid. MUST

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d If we add a substance to a red-cabbage solution and it stays red, then we are sure that the substance isn’t an alkali. CAN’T

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e If we add a substance to a red-cabbage solution and it turns green, then the substance is sure to be an alkali. MUST

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f If we put some litmus paper in a solution and it turns red, then we are sure that the solution isn’t an alkali. CAN’T

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g If it’s not an acid, or an alkali, then it’s sure to be neutral. MUST

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h If we use a universal indicator to check a substance, and it turns purple, then we are sure that the substance isn’t an acid. CAN’T

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