Q20 ) Sita prepared two types of solutions in two different beakers “A” and “B”
In Beaker “A” - the solution prepared is of juice of lemons and water .
In Beaker “B” - the solution is of oil and water.
(A) What kind of a solution is in Beaker “A”
(B) Define the type of solution in Beaker “A”
(C) What kind of a solution is in beaker “B”
(D) Define the type of solution in beaker “B”
(E) With which apparatus can se separate the solution in Beaker “B” ?
Answers
Explanation:
Mixtures are constituted by more than one kind of pure form of matter, known as a substance. A substance cannot be separated into other kinds of matter by any physical process. We know that dissolved sodium chloride can be separated from water by the physical process of evaporation. However, sodium chloride is itself a substance and cannot be separated by physical process into its chemical constituents. Similarly, sugar is a substance because it contains only one kind of pure matter and its composition is the same throughout. Soft drink and soil are not single substances. Whatever the source of a substance may be, it will always have the same characteristic properties.Therefore, we can say that a mixture contains more than one substance.
Types of Mixtures
✍We can use phenolphthalein to check which of the beakers contains acid and which one contains a base because phenolphthalein is often used as an indicator in acid-base titrations, it turns colourless in acidic solutions and pink in basic solutions.
✍Apart from that, we can also use other natural indicators; like China rose or turmeric.
✍Turmeric is used as another natural indicator. Turmeric is of yellow colour. Turmeric paper turns into red when it is dipped into a basic solution. Turmeric paper does not change its colour with acid.
✍China rose is another natural indicator. China rose solution gives dark pink (magenta) colour with acid and green colour with base...