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RUDIKE [14]
3 years ago
15

A buffer contains significant amounts of ammonia and ammonium chloride.

Chemistry
1 answer:
Oksanka [162]3 years ago
8 0

Answer:

a. HCl + NH₃ ⇄ NH₄Cl

b. KOH + NH₄⁺ ⇄ K⁺ + NH₃ + H₂O

Explanation:

A buffer system is made by a weak base (ammonia, NH₃) and its conjugate acid (ammonium ion NH₄⁺ coming from ammonium chloride NH₄Cl). Its function is to resist abrupt changes in the pH when acids or bases are added.

a. When aqueous hydrochloric acid is added, it reacts with the base of the buffer. The corresponding equation is:

HCl + NH₃ ⇄ NH₄Cl

b. When aqueous potassium hydroxide is added, it reacts with the acid of the buffer. The corresponding equation is:

KOH + NH₄⁺ ⇄ K⁺ + NH₃ + H₂O

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The number of moles in each sample will be 0.391 moles, 30.7 moles, 0.456 moles, and 1350 moles

<h3>What is the number of moles?</h3>

The number of moles of a substance is the ratio of the mass of the substance to the molar mass.

In other words; mole = mass/molar mass.

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  • moles of 18.0 g NO_2 = 18.0/46

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  • moles of 191.8 kg Na_2SO_4 = 191800/142

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More on the number of moles of substances can be found here: brainly.com/question/1445383

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