$A$ group of students took an old shoe box and covered it with black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. They placed a milk sample contained in a beaker/tumbler in the box as shown in the figure. They were amazed to see that the milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it.
$(a)$ Explain why the milk sample was illuminated. Name the phenomenon involved.
$(b)$ Same results were not observed with a salt solution. Explain.
$(c)$ Can you suggest two more solutions which would show the same effect as shown by the milk solution?
$(a)$ Explain why the milk sample was illuminated. Name the phenomenon involved.
$(b)$ Same results were not observed with a salt solution. Explain.
$(c)$ Can you suggest two more solutions which would show the same effect as shown by the milk solution?
(N/A) Milk is a colloid. Colloidal particles are large enough to scatter a beam of light passing through them,which makes the path of light visible. This phenomenon is known as the Tyndall effect.
$(b)$ $A$ salt solution is a true solution. The particles in a true solution are extremely small (less than $1 \ nm$ in diameter) and are unable to scatter the beam of light passing through them. Therefore,the path of light is not visible in a salt solution.
$(c)$ Two other examples of colloidal solutions that show the Tyndall effect are starch solution and soap solution.
$(b)$ $A$ salt solution is a true solution. The particles in a true solution are extremely small (less than $1 \ nm$ in diameter) and are unable to scatter the beam of light passing through them. Therefore,the path of light is not visible in a salt solution.
$(c)$ Two other examples of colloidal solutions that show the Tyndall effect are starch solution and soap solution.
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Similar Questions
$(a)$ Calculate the mass of potassium chloride required to prepare its $40 \%$ solution in $100 \, g$ of water.
$(b)$ Explain the term solubility and the effect of temperature on it.
$(b)$ Explain the term solubility and the effect of temperature on it.
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View SolutionHow are colloids different from suspensions? Identify the colloids from the following: Soda water,milk,sponge,clouds,mixture of alcohol and water,jelly.
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View SolutionBased on which factor is a solution said to be dilute,concentrated,or saturated?
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View SolutionPragya tested the solubility of four different substances at different temperatures and collected the data as given below (results are given in the following table,as grams of substance dissolved in $100 \,g$ of water to form a saturated solution).
Substance Dissolved $283 \,K$ $293 \,K$ $313 \,K$ $333 \,K$ $353 \,K$ Potassium nitrate $21$ $32$ $62$ $106$ $167$ Sodium chloride $36$ $36$ $36$ $37$ $37$ Potassium chloride $35$ $35$ $40$ $46$ $54$ Ammonium chloride $24$ $37$ $41$ $55$ $66$
$(a)$ Find the solubility of each salt at $293 \,K$. Which salt has the highest solubility at this temperature?
$(b)$ What is the effect of change of temperature on the solubility of a salt?
| Substance Dissolved | $283 \,K$ | $293 \,K$ | $313 \,K$ | $333 \,K$ | $353 \,K$ |
| Potassium nitrate | $21$ | $32$ | $62$ | $106$ | $167$ |
| Sodium chloride | $36$ | $36$ | $36$ | $37$ | $37$ |
| Potassium chloride | $35$ | $35$ | $40$ | $46$ | $54$ |
| Ammonium chloride | $24$ | $37$ | $41$ | $55$ | $66$ |
$(a)$ Find the solubility of each salt at $293 \,K$. Which salt has the highest solubility at this temperature?
$(b)$ What is the effect of change of temperature on the solubility of a salt?
Medium
View SolutionAnswer the following:
$(a)$ Under which category of mixtures will you classify alloys and why?
$(b)$ $A$ solution is always a liquid. Comment.
$(c)$ Can a solution be heterogeneous?
$(a)$ Under which category of mixtures will you classify alloys and why?
$(b)$ $A$ solution is always a liquid. Comment.
$(c)$ Can a solution be heterogeneous?
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