Question

What mass of water in kg would remain in the container after 200. g of NaCl was added to the 1.00 L of water in a 1.00 L container? (Assume the density of water is 1.00 g/mL)

Answer 1

This question can be taken in different ways.

1)When the total container volume is not exactly 1L.

No containers in research labs are exactly the volume mentioned.That means a 10ml beaker is calibrated to 10ml, but there will be some extra space in the container. So if one more substance is added, the container can accommodate the same.

If the container is of this type, when the 200g of NaCl is added,

Total mass of water and salt = 1000g + 200g =1200g

a)Here comes the next choice. If the question is about the weight of only water, it is 1Kg

b)If it is the weight of saline water the answer is 1.2Kg

2)If the vessel is exactly 1L.According to Archimedes principle, when 200g of NaCl is added to the water , it displaces the 200g of water from the container.

a)Then the weight of pure water = 800g = 0.8 Kg

b)Weight of saline water = 800g + 200g =1000g=1Kg