Chemistry, 27.11.2019 05:31 joeylozier15

Aprecipitation reaction is caused by mixing 100. ml of 0.25 m k2cr2o7 solution with 100. ml of 0.25 m pb(no3)2 solution. when the precipitate forms, it is filtered from the mixture. what is the concentration of nitrate anion in the reaction mixture after filtration? 0.50 m0.10 m0.0 m0.25 m

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Answer from: damianb25

The molarity of the nitrate ion = 0.25 M

Explanation:

Step 1: Data given

Volume of 0.25 M K2Cr2O7 = 100 mL = 0.1 L

Volume of 0.25 M Pb(NO3)2 =100 mL = 0.1 L

Step 2: The balanced equation

Pb(NO3)2(aq) + K2Cr2O7(aq) → PbCr2O7(s) + 2KNO3(aq)

PbCr2O7(s) + 2KNO3(aq) → PbCr2O7(s) + 2K+ + 2NO3-

Step 3: Calculate moles of K2Cr2O7

Moles K2Cr2O7 = Molarity K2Cr2O7 * volume

Moles K2Cr2O7 = 0.25M * 0.1 L

Moles K2Cr2O7 = 0.025 moles

Step 4: Calculate moles of Pb(NO3)2

Moles Pb(NO3)2 = 0.25 M * 0.1 L

Moles Pb(NO3)2 = 0.025 moles

Step 5: Calculate limiting reactant

For 1 mol Pb(NO3)2 consumed, we need 1 mol of K2Cr2O7, to produce 1 mol of PbCr2O7 and 2 moles of KNO3

Both reactant will be completely consumed. since there will react 0.025 moles of both.

Step 6: Calculate moles of KNO3

For 1 mol Pb(NO3)2 consumed, we need 1 mol of K2Cr2O7, to produce 1 mol of PbCr2O7 and 2 moles of KNO3

For 0.025 mol Pb(NO3)2, we have 2*0.025 = 0.050 moles of KNO3

Step 7: Calculate moles of nitrate ion

2 moles KNO3 will dissociate in 2 moles of K+ and 2 moles of NO3-

For 0.050 moles KNO3, we'll have 0.050 moles of NO3-

Step 8: Calculate molarity of NO3- ion

Molarity NO3- = moles NO3- / volume

Molarity NO3- = 0.050 moles/ 0.2L

Molarity NO3- = 0.25 M

The molarity of the nitrate ion = 0.25 M

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

Answer from: Quest

No is the answer to the question

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Aprecipitation reaction is caused by mixing 100. ml of 0.25 m k2cr2o7 solution with 100. ml of 0.25...

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