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Strike441 [17]
3 years ago
13

Suppose you stir a little baking soda into water until the water looks clear again. How could you prove to someone that the clea

r material is a solution, not a compound?
Chemistry
2 answers:
HACTEHA [7]3 years ago
4 0
You can prove this by letting the water evaporate or using a instrument that can measure the solids in a liquid.
7nadin3 [17]3 years ago
3 0

Explanation:

A solution is defined as the substance formed due to addition of two or more number of substances. A solution is a homogeneous mixture.

And, homogeneous mixtures are always clear solution. Particles of a homogeneous solution never combine chemically with each other.

For example, when we dissolve baking soda in water then it will completely dissolve in water forming a clear solution.

So, in order to determine that it is a solution we can let the water from the solution to evaporate.

This will leave behind the solute, that is, baking soda in the vessel. This will show that it is a solution.

Whereas a compound is defined as the substance in which different elements are chemically combined together in a fixed ratio by mass.

For example, MgSO_{4} is a compound and elements are present in 1:4 ratio.

Components of a compound can only be separated by chemical means and not by any physical means.

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Will the ph of a solution of nh4cn be >7, <7, or =7?
never [62]
PH of a solution will be <span>higher than 7
</span>
Ammonium cyanide is a salt formed by hydrogen cyanide and ammonia. Ammonia is a weak base and hydrogen cyanide is a weak acid. 
NH₄CN + H₂O ⇒ NH₃ + HCN 

NH₄⁺ + H₂O -----> H₃O⁺ + NH₃

CN⁻ + H₂O -----> HCN + OH⁻ 

Although both compounds are weak electrolytes, NH₃ is somewhat stronger base than HCN is a strong acid, so the solution reacts alkaline. We can prove this using Ka and Kb values:

Ka(HCN) = 4.9 x × 10⁻¹⁰

Kb(NH₃) = 1.8 × 10⁻⁵<span>
Kw= </span>1.0 × 10⁻¹⁴

Let's first calculate Ka for NH₄⁺: 
Ka(NH₄⁺) x Kb(NH₃<span>) = pKw

</span>Ka(NH₄⁺) = Kw/Kb(NH₃) = 5.6 x 10⁻¹⁰

Then, Kb for CN⁻:

Kb(CN⁻) x Ka(HCN) = pKw

Kb(CN⁻) = Kw/Ka(HCN) = 2 x 10⁻⁵

 
From this, we can see that the acid constant NH4⁺ is much lower than the base constant of CN⁻, which will say that the solution of NH₄CN will react slightly alkaline because of the higher presence of hydroxyl ions in solution.


7 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST
bija089 [108]

Answer:

sorry i'm not a scientist but i think it's C

Explanation:

sorry again if i get it wrong for u :(

3 0
2 years ago
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