How To Find Potassium Dichromate And Hydrochloric Acid

Posted by on April 24, 2012

Donald asks…

calculate the moles of potassium dichromate used in this reaction.?

Given: 2.50 moles of iron(iii) chloride react with an excess of a a 0.600M solution of potassium dichromate and hydrochloric acid.
6FeCl2 + 1K2Cr2O7 +14HCI —–> 6FeCl3 + 2CrCl3 + 2KCI + 7H20

Help me through the steps please! :)

answers:

1. You are given the moles of FeCl3 reacted so start with it. The coefficients in the balanced equation show the molar ratio of the materials involved in the reaction. We are only interested in the relationship between the FeCl3 and the K2Cr2O7 – a 6:1 ratio. The reaction uses 6 times more FeCl3 than K2Cr2O7. So we simply have to divide the number of moles of FeCl3 by 6 since the reaction uses 1/6 the number of moles.

2.5 mol FeCl3 x (1 mol K2Cr2O7 / 6 mol FeCl3) = 0.417 mole K2Cr2O7

Thomas asks…

calculate the volume (in liters) of potassium dichromate used in this reaction?

Given: 2.50 moles of iron(iii) chloride react with an excess of a a 0.600M solution of potassium dichromate and hydrochloric acid.
6FeCl2 + 1K2Cr2O7 +14HCI —–> 6FeCl3 + 2CrCl3 + 2KCI + 7H20

1. Calculate the moles f potassium dichromate used in this reacion. the answer is 0.417
Now I need to…
2. Calculate the volume (in liters) of potassium dichromate used in this reaction.

Help me through the steps please! :)

answers:

Since you have the moles potassium dichromate from 1 is 0.417 moles and the solution is 0.600 M (or moles/L)

0.417 moles x 1L/.06000moles = 0.695 L

William asks…

Chemistry : chemical reactions?

1.the residue of magnesium ribbon , then added to water . Is it soluble or not soluble ? (the magnesium ribbon is burned , then the residue was added to water , is this soluble or not ?)

2.type of reaction between copper sulfate and iron ?

3.write the balanced chemical equation between ferrous sulfate and copper ?

4. type of reaction between magnesium ribbon and hydrochloric acid ?

5.write the balanced chemical equation between hydrochloric acid and copper ?

6.write the type of reaction and the balanced chemical equation between carbon tetrachloride and potassium bromide ?

7.write the type of reaction and the balanced chemical equation between Lead (II) Nitrate and potassium dichromate ?

8. what substance is responsible for the change in color of the red lithmus paper that was added to the burned residue of magnesium ribbon with water ? (the magnesium ribbon is burned , then the residue was added to water , then a red litmus paper was put to it and then the red litmus paper turned blue what is the substance responsible for the change in color of the litmus paper ? )

9.in which of the reactions has displacement taken place ? Explain why displacement did not take place in some of the substances combined .

The substances are :
1. copper sulfate and iron
2. ferrous sulfate and copper
3. magnesium ribbon and hydrochloric acid
4. carbon tetrachloride and potassium bromide
5. lead nitrate and potassium dichromate
6. hydrochloric acid and copper
Notice : the format of the answer should be ” the reactions that have displacement taken place are
…………… and the reaction that have no displacement taken place are ……….. because , ……………. . ”

10.define the ff.
a.chemical reaction
b.reactant
c.catalyst

answers:

There are way too many questions here … You’d probably get more responses if you posted just a few at a time … Anyway I’ll do the first six:

1. 2Mg + O? ? 2MgO

so the residue is MgO which is insoluble … [like most oxides]

2. Fe + CuSO? = FeSO? + Cu … Which is a single displacement reaction

3. Ferrous sulfate is iron(II) sulfate … So FeSO?

FeSO? + Cu ? CuSO? + Fe

4. 2Mg + 2HCl ? 2MgCl + H? … Which is another single displacement reaction

5. Cu + 2HCl ? CuCl? + H?

6. CCl? + 4 KBr = CBr? + 4 KCl and that is a double displacement reaction

Mark asks…

An Alkane will react with which of the following:?

(A) conc. potassium hydroxide.
(B) conc. hydrochloric acid.
(C) potassium dichromate solution.
(D) Chlorine in diffused sunlight.
(E) Sodium Metal.

AND WHY?

answers:

D.

The alkane will undergo substitution ie. One or two of the hydrogens one the chain will be replaced with chlorine to give either HCL or hydrogen gas. UV light is the catalyst. Nothing will happen otherwise, without the UV.

Nancy asks…

chemical equations need help URGENT!!!?

i need these equations solved and balanced please:

sodium chromate + hydrochloric acid –>
sodium chromate + hydrochloric acid + sodium hydroxide –>

potassium dichromate + sodium hydroxide –>
potassium dichromate + sodium hydroxide + hydrochloric acid –>

thanks

answers:

Instead of giving u the answer, i’ll let u think abt it.

Chromate and dichromate are oxidising agents. Think abt what happens to them after they oxidise something (they get reduced themself to smth else.)

HCl has Cl- ions. Cl- gets oxidised to Cl2

OH- ions get oxidised to oxygen and water. 4OH- –> O2 + 2H2O + 4e-

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