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Fofino [41]
4 years ago
9

Which of the following is a homogeneous mixture? a.sodium chloride b.oxygen c.salad d.salt water

Chemistry
2 answers:
Vikentia [17]4 years ago
4 0
Your answer to this is:
D. Salt water
Doss [256]4 years ago
4 0

Answer: Option (d) is the correct answer.

Explanation:

A mixture in which solute particles are unevenly distributed into the solvent then it is known as a heterogeneous mixture.

For example, salad is a heterogeneous mixture.

Components of a mixture never combine chemically with each other.

A homogeneous mixture is defined as the mixture in which solute particles are evenly distributed in a solvent.

A homogeneous mixture is a clear solution.

For example, salt dissolved in water is a homogeneous mixture.

Sodium chloride is a chemical compound and not a mixture. Whereas oxygen is an element and not a mixture.

Thus, we can conclude that out of the given options salt water is a homogeneous mixture.

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Which of the following reagents is/are likely to be used to form the Britton–Robinson buffer solution used in the experiment?
Ierofanga [76]

Answer:

I. A polyprotic, weak acid

II. Na2HPO4

Explanation:

Buffer solutions are those that, upon the addition of an acid or base, are capable of reacting by opposing the part of the basic or acid component to keep the pH fixed.

Buffers consist of hydrolytically active salts that dissolve in water. The ions of these salts are combined with acids and alkalis. These hydrolytically active salts are the products that result from the reaction between weak acids and strong alkalis such as calcium carbonate (from carbonic acid and calcium hydroxide) or between strong acids and weak alkalis such as ammonium chloride (a from hydrochloric acid and ammonium hydroxide).

A buffer acid reacts when a weak acid or weak base is combined with its corresponding hydrolytic salt in a water solution, a buffer system called a buffer is formed. As in this case a weak polyrotic acid with Na2HPO4, which allows the solution to be maintained at a pH of 3.8 against small aggregate amounts of both acid and base, thus favoring the reaction at a pH of 3.8

A buffer system is not always appropriate, because the ions of some hydrolytic salts can, for example, damage organisms that come into contact with it.

4 0
3 years ago
What is the healthy percentage of body fat for men?
Jet001 [13]

Answer:

Ideal body fat percentage for men

Category Percentage

Essential fat     2-5%

Athletes             6-13%

Fitness             14-17%

Acceptable     18-24%

Explanation:

5 0
3 years ago
In the presence of CN-, Fe3 forms the complex ion Fe(CN)63-. The equilibrium concentrations of Fe3 and Fe(CN)63- are 8.5 x 10-40
aleksklad [387]

Answer:

Kf = 9.96x10⁴¹

Explanation:

When Fe³⁺ and CN⁻ are in water, complex Fe(CN)₆³⁻ is formed, thus:

Fe³⁺ + 6CN⁻ ⇄ Fe(CN)₆³⁻

Kf is defined as:

Kf = [Fe(CN)₆³⁻] / [Fe³⁺] [CN⁻]⁶

Equilibrium concentration of ions is:

[Fe(CN)₆³⁻] = 1.5x10⁻³M

[Fe³⁺] = 8.5x10⁻⁴⁰

[CN⁻] = [KCN] = 0.11M

Replacing in Kf expression:

Kf = [1.5x10⁻³M] / [8.5x10⁻⁴⁰] [ 0.11M]⁶

<h3>Kf = 9.96x10⁴¹</h3>

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3 years ago
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Why is water considered to be neutral?
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