Bukedde TV organizes food peparations competitions every year. In 2024, two contestants Tracy and Prossy applied to participate in the competitions and the winner was promised a pizza for the most delicious meal prepared. Tracy prepared a very good meal which looked very nice and produced a very interesting aroma. However, on testing chef yassin complained that the food was tasteless. When the second chef, Alex tested, he told Tracy that she had missed adding salt and therefore Tracy missed prize. TASK; As a learner of chemistry help; (a)(i) Explain the category of the substance Tracy missed adding in the food. (ii) State the chemical elements present in the substance in a(i) above and write the formula of their ions. (b) Explain how the substance is formed. (c) Evaluate the use and impacts of the substance.

a)

i) The substance Tracy missed adding to the food is salt, which is chemically known as sodium chloride ($\text{NaCl}$).
This substance belongs to the category of ionic compounds. It is also classified as a mineral and, in a culinary context, a seasoning or flavour enhancer.

ii) The chemical elements present in sodium chloride are:

• Sodium ($\text{Na}$)
• Chlorine ($\text{Cl}$)

The formulas of their ions are:

• Sodium ion: $\text{Na}^+$
• Chloride ion: $\text{Cl}^-$

b) The substance, sodium chloride, can be formed in a few ways:

• From its constituent elements: Sodium metal reacts vigorously with chlorine gas. During this reaction, each sodium atom loses one electron to become a positively charged sodium ion ($\text{Na}^+$), and each chlorine atom gains one electron to become a negatively charged chloride ion ($\text{Cl}^-$). These oppositely charged ions are then attracted to each other, forming an ionic bond and a crystal lattice of sodium chloride.

$$2\text{Na(s)} + \text{Cl}_2\text{(g)} \longrightarrow 2\text{NaCl(s)}$$

• Through a neutralization reaction: It can also be formed when a strong acid, such as hydrochloric acid ($\text{HCl}$), reacts with a strong base, such as sodium hydroxide ($\text{NaOH}$). This reaction produces sodium chloride and water.

$$\text{HCl(aq)} + \text{NaOH(aq)} \longrightarrow \text{NaCl(aq)} + \text{H}_2\text{O(l)}$$

c)
Uses of sodium chloride:

• Food seasoning and flavour enhancer: It is widely used to improve the taste of food.
• Food preservation: Salt is used to cure meats and fish, and in pickling vegetables, by drawing out moisture and inhibiting microbial growth.
• Essential nutrient: It is vital for human health, playing a crucial role in nerve impulse transmission, muscle contraction, and maintaining fluid balance in the body.
• Industrial applications: It is a raw material for the production of chlorine gas, sodium hydroxide, and other chemicals.

Impacts of sodium chloride:

• Positive impacts: Enhances the palatability and shelf life of food, and is indispensable for proper physiological functions in living organisms.
• Negative impacts: Excessive consumption of sodium chloride is linked to high blood pressure (hypertension), which increases the risk of heart disease, stroke, and kidney problems.