# What is the molarity of a NaOH solution if 250 mL contains 1 mg of NaOH? (a) 10-1 M (b) 10-2 M (c) 10-4 M (d) 10-3 M

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Updated on: September 25th, 2023

The molarity of a NaOH solution if 250 mL contains 1 mg of NaOH is 10-4 M. Steps to calculate the molarity of a NaOH solution.

Step 1 – we know that

Number of moles of NaOH = given mass of NaOH/ molar mass = 10-3/40

Step 2 – The formula of molarity is given by

Molarity = (number of moles of solute/ volume of solution) x 1000

Molarity = [(10-3/40) x 1000]/ 250 = 10-4 M

### Uses of NaOH

• It is employed in the production of soaps and detergents.
• It is used to create chlorine that is similar to bleach.
• It’s a component in drain cleaners.
• It is employed by the municipal water treatment facility to remove heavy metals from the water.
• It serves as a barrier against the growth of germs and mould in food preservatives.
• It’s employed in canning.
• Both papermaking and paper recycling use it.

### Health Effects of NaOH

1. Contact with excessively high sodium hydroxide concentrations can cause severe burns to the eyes, skin, digestive system, or lungs that can end in death or permanent damage.
2. Damage could occur to the mucous membranes in the nose, throat, lungs, and bronchial system. Significant harm can be caused by even minute doses.
3. The skin is burned and the eyes are harmed by sodium hydroxide. It is irritating to the respiratory system. The mucous membranes of the nose become irritated.

### Safety Measures of NaOH

1. Don’t let anything touch your skin, eyes, or clothing.
2. Inhaling gases, fumes, dust, mist, vapour, or aerosols is not advised.
3. Put on gloves, safety glasses, and clothing.
4. Mixing acids is not recommended. When handling chemicals, refrain from eating, drinking, smoking, and using personal goods.

Summary:

## What is the molarity of a NaOH solution if 250 mL contains 1 mg of NaOH? (a) 10-1 M (b) 10-2 M (c) 10-4 M (d) 10-3 M

The molarity of a NaOH solution if 250 mL contains 1 mg of NaOH is 10-4 M. Molarity is defined as the number of moles of solute in 1 litre of solution. It is the most widely used concentration unit and is represented as M.

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