Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
- netralization with NaOHfoolowed by filtration
- neutralization with NaOH followed by distillation
- fractional distillation
-
filtration followed by distillation
The correct answer is: D
Explanation
To obtain pure water from a mixture of sand, water, and methanoic acid, we need to consider the properties of each component:
- Sand is insoluble in water and can be removed by filtration.
- Methanoic acid (formic acid) is a volatile liquid that can be separated from water by distillation.
- Water is the desired product.
Considering these properties, the correct answer is: Option D. (Filtration followed by distillation)
Here's the step-by-step process:
1. Filtration: Remove the sand from the mixture by passing it through a filter paper.
2. Distillation: Distill the resulting liquid mixture to separate the methanoic acid from the water. Since water has a lower boiling point than methanoic acid, it will vapourize and condense first, allowing you to collect the pure water.
There is an explanation video available .