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vladimir2022 [97]
3 years ago
13

Determine the oxidation number of CI element in each of the following species:

Chemistry
1 answer:
labwork [276]3 years ago
3 0
Fbbrnev said he was still in a coma and he said he was still in a coma and
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If the a of a monoprotic weak acid is 1. 2×10^−6. What is the [H] of a 0. 31 m solution of this acid?
Vanyuwa [196]

The pH of the solution of the given acid is 3.099

Let  HX  be the weak acid:

HX ⇌  H^{+}+ X^{-}

For which:

K_{a} = [ H^{+}][ X^{-}] / [HX]

If  K_{a} lies in the range 10^{-4} - 10^{-10}we can assume that the equilibrium concentrations used in the expression are a good enough approximation to the initial concentrations.

Rearranging and taking negative logs of both sides gives:

pH = \frac{1}{2} [pK_{a} - loga]

a is the concentration of the acid.

pK_{a} =-logK_{a} = -log (2×10^{-6}) = 5.69

pH = \frac{1}{2} [5.69- (-0.508)]

pH = 3.099

Learn more about pH of acid here;

brainly.com/question/13043236

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3 0
2 years ago
Describe any evidence that a chemical reaction occurred when you added 6 m hcl to the solution of sodium acetylsalicylate, also
irina1246 [14]

The evidence that a chemical reaction occurred is can be change in color , formation of a precipitate , Here in the case when 6 m HCl to the solution of sodium acetylsalicylate, the formation of precipitate that is of aspirin takes places that can be taken as a evidence that a reaction is occured. The reaction can be seen in the image attached.

3 0
3 years ago
Manganese (Mn) has many possible oxidation numbers (+2 and +4 are just two of these). Write the correct formulas and names for t
ohaa [14]

Answer:

Oxide of manganese, Potassium permanganate, Manganese bromide and manganese oxide.

Explanation:

1. Manganese dioxide

Its chemical formula is $MnO_2$. It is +4 oxidation state. It is a black solid which is fairly stable.

2. Potassium permanganate

Its chemical formula is $KMnO_4$. It is commonly used in the laboratories as oxidizing agent. They appear black in color.

3 Manganese bromide

Its chemical formula is $MnBr_2$

4. Oxides of manganese

Chemical formula is $Mn_3O_4$

The most stable state of Manganese is +2 oxidation state.

5 0
3 years ago
Describe the physical properties of water
Zepler [3.9K]
<span>Water has a high specific heat. ...Water in a pure state has a neutral pH. ...Water conducts heat more easily than any liquid except mercury. ...Water molecules exist in liquid form over an important range of temperature from 0 - 100° Celsius. ...<span>Water is a universal solvent.</span></span>
7 0
3 years ago
An electrochemical cell contains a standard hydrogen electrode and a cathode consisting of a metallic chromium electrode, Cr(s),
stira [4]

Answer:

c. I, II and III

Explanation:

The cell is as follows

Cr / Cr⁺²(1M) // H⁺ ( 1 M ) / H₂

Standard reduction potential of hydrogen cell is zero . Standard reduction potential is negative E for Cr⁺² / Cr(1M) half cell

Cell potential = Ecathode - Eanode

= 0 - ( - E)

= E

E is cell potential and also standard cell potential or emf of the cell .

Standard reduction potential that is for Cr3+/Cr.  is  - E .

Hence statement I , II , III are right . IV th statement is wrong because of sign

Option c is correct.

5 0
3 years ago
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