Materials for Storing Acids
Acids are substances that can be highly reactive and corrosive. This means they can potentially damage or react with the material of the container they are stored in. Therefore, choosing the right container material is crucial for safety and to prevent contamination or degradation of the acid.
Evaluating Container Material Options for Acids
When selecting materials for storing acids, it's important to consider their chemical inertness and resistance to corrosion. Let's look at the options provided:
- Rubber and cardboard: Cardboard is made from paper pulp and is highly susceptible to damage from liquids, especially corrosive acids. Rubber might offer some resistance to certain acids, but it's not a universal or primary choice for storing a wide range of acids.
- Wood and paper: Similar to cardboard, wood and paper are organic materials that readily absorb liquids and are easily degraded by acids. They offer virtually no protection and are unsuitable for acid storage.
- Metals and plastic: Many common metals react significantly with acids, leading to corrosion and potential container failure (e.g., rusting of iron). While certain specialized plastics (like polyethylene or polypropylene) are resistant to many acids, the combination with metals in this option makes it less ideal compared to other choices, as many metals are unsuitable.
- Glass and ceramics: These materials are known for their excellent chemical stability and resistance to corrosion by a wide variety of acids. Glass, in particular, is widely used in laboratories for storing and handling acids due to its inert nature. Glazed ceramics also provide a durable and non-reactive surface suitable for acid containment. (Note: Hydrofluoric acid is an exception as it attacks glass).
Preferred Materials for Acid Containers
Based on chemical properties, glass and ceramics stand out as highly suitable materials for storing most types of acids. Their resistance to chemical attack ensures the integrity of the container and prevents contamination of the stored acid. This makes them the most appropriate choice among the given options for general acid storage.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
