Answer:
2.58
Explanation:
Each tablet has a mass of 470 mg. The mass of 2 tablets is 2 × 470 mg = 940 mg = 0.940 g
The molarity of acetylsalicylic acid (aa) is:
M = mass of aa / molar mass of aa × liters of solution
M = 0.940 g / 180.16 g/mol × 0.240 L
M = 0.0217 M
Acetylsalicylic acid is a weak acid, so we can find [H⁺] using the following expression.
[H⁺] = √(Ca × Ka)
where,
Ca: concentration of the acid
Ka: acid dissociation constant
[H⁺] = √(0.0217 × 3.24 × 10⁻⁴)
[H⁺] = 2.65 × 10⁻³ M
The pH is:
pH = -log [H⁺] = -log 2.65 × 10⁻³ = 2.58
The main purpose of a buffer solution is just to resist the change in pH so that the pH of the solution won't be much affected when we add an acid or base into it. The added acid or base is neutralized.
If it is heated while it is being compressed or held inside a container as such, the pressure build up while in the container and the pressure can become so much that the container will burst.
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