Ans:
Some discussion points and answers:
How many spoons of salt were you able to dissolve before some of it remained undissolved?
Answer: The number of spoons varies, typically 2-4 spoons, depending on the water volume and temperature, before undissolved salt remains.
What does this indicate about the capacity of water to dissolve salt?
Answer: This indicates that water has a limited capacity to dissolve salt, reaching a saturation point where no more salt can dissolve.
What will happen if we keep on adding more salt in a given amount of water?
Answer: If more salt is added beyond the saturation point, it will not dissolve and will settle at the bottom of the tumbler.
Answer:
What happens to the undissolved baking soda?
Answer: The undissolved baking soda dissolves when heated to 50 °C.
What do you observe?
Answer: At 70 °C, the previously undissolved baking soda also dissolves, and more can be added until it again becomes saturated.
What do you infer from this experiment?
Answer: Water at 70 °C dissolves more baking soda than at 50 °C or 20 °C, indicating that solubility of solids like baking soda generally increases with an increase in temperature.
Answer: The mass of the stone is measured as 16.400 g using the digital weighing balance after taring with the watch glass.
Take a measuring cylinder and observe it carefully. Note down the following:
Answer:
What is the maximum volume it can measure?
Answer: For the 100 mL measuring cylinder, it can measure up to 100 mL.
What is the smallest volume it can measure?
Answer: The smallest volume is 1 mL, as calculated from the divisions.
How much is the volume difference indicated between the two bigger marks?
Answer: 10 mL (e.g., between 10 mL and 20 mL).
How many smaller divisions are there between the two bigger marks?
Answer: 10 divisions.
How much volume does one small division indicate?
Answer: 1 mL (10 mL ÷ 10 divisions).
Q: Why are measuring cylinders always designed narrow and tall instead of wider and short like a beaker?
Ans: Measuring cylinders are made narrow and tall so that the liquid level rises higher and the markings are farther apart. This makes it easier to read the exact volume accurately. If the cylinder were wide and short like a beaker, the markings would be too close together, and the reading would be less precise.
Ans:
What do you notice?
Answer: The water level rises from 50 mL to 55 mL when the stone is submerged.
Volume of the object:
Answer: 5 cm³ (55 mL - 50 mL).
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