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yanalaym [24]
2 years ago
12

Why did you test the reaction mixture with starch/iodide paper before starting the separatory funnel steps

Chemistry
1 answer:
-Dominant- [34]2 years ago
3 0

Answer:

This paper is impregnated with iodide ions and starch and will turn black if treated with an oxidizing agent (e.g. HOCl) which oxidizes the iodide ions

Explanation: hope this helps :)

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A solution contains some or all of the ions Cu²⁺, Al³⁺, K⁺, Ca²⁺, Ba²⁺, Pb²⁺, and NH₄⁺. The following tests were performed, in o
Nina [5.8K]

Answer:

Among given, the ions which are present in the given solution are:

Cu²⁺, Al³⁺ and K⁺

Among given, the ions which are absent in the given solution are:

Pb²⁺, Ca²⁺ and Ba²⁺

The ion which no conclusion is NH₄⁺.

Explanation:

Reagents given are used in salt analysis. The salt analysis is a qualitative analysis used for the identification of cations and anions of inorganic salts.

HCl is used for the identification of group I cations. As no reaction occurred when HCl is added to the solution, that means group I cations are absent.

So, among the given Pb²⁺ is a group I cation, therefore, Pb²⁺ is absent.

H₂S along with HCl is used for the identification group II salts.

Addition of Addition of H₂S with 0.2 M HCl produced a black solid, so, group II cation Cu²⁺ is present.

H₂S is used for the identification of group III cations.

When H₂S is added to the filtrate of group II, white precipitate is formed that means group III cations are present. Among group III cations, Al³⁺ is present.

Addition of (NH₄)₂HPO₄ in the presence of NH₃ is used for the identification of group IV cations.

As no precipitate is formed, therefore, group IV cations are absent.

So among given options, Ca²⁺ and Ba²⁺ are absent in the given solution.

The final supernatant when heated produces purple flame which indicates the presence of K⁺.

Therefore, among given, the ions which are present in the given solution are:

Cu²⁺, Al³⁺ and K⁺

Among given, the ions which are absent in the given solution are:

Pb²⁺, Ca²⁺ and Ba²⁺

The ion which no conclusion is NH₄⁺.

5 0
3 years ago
EASYYYYYYY!!!!!!!!!!!!!!
eduard

Answer:

Agriculture was practiced for thousands of years without the use of artificial chemicals. Artificial fertilizers were first created during the mid-19th century. These new agricultural techniques, while beneficial in the short term, had an Institute of Plant Industry to improve traditional farming methods in India.

Explanation:

6 0
2 years ago
The motion of atoms and molecules that most affects temperature is
Oliga [24]
A solid to a liquid, the boiling of water, solid the water molecules vibrate condensed but as a liquid they are still isolated in a controlled area and also reflect off one another more, liquid to a gas they do not and move freely until condensation occurs
3 0
4 years ago
Chromuate found inside which of the following structures of a eukaryotic cell?
dimulka [17.4K]

Answer:

Chromuates are found in the chromosomes of the eukaryotic cells!!!!

Explanation:

I learned this in 7th grade!!!!

Mark Me Brainliest plzz

4 0
3 years ago
calculate the water potential of a solution of 0.15m sucrose. the solution is at standard temperature.
Mrac [35]

Answer:

The water potential of a solution of 0.15 M sucrose solution is -3.406 bar.

Explanation:

Water potential = Pressure potential + solute potential

P_w=P_p+P_s

P_w=P_p+(-iCRT)

We have :

C = 0.15 M, T = 273.15 K

i = 1

The water potential of a solution of 0.15 m sucrose= P_w

P_p=0 bar (At standard temperature)

P_s=-iCRT=-\times 1\times 8.314\times 10^{-2}bar L/mol K\times 273.15 K=-3.406 bar

P_w=0 bar+(-3.406 ) bar

The water potential of a solution of 0.15 M sucrose solution is -3.406 bar.

7 0
3 years ago
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