Calculating and Mixing NiAc and ZnAc Solutions for Molar Proportion

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In summary, the conversation discusses how to calculate and mix NiAc and ZnAc solutions in different nominal molar proportions. The formula for molar fraction is mentioned, and calculations are provided for a Ni/Zn nominal proportion of 1%. The correct calculation for this proportion is then clarified, and the process is explained for achieving a 1% ratio when starting with equal molarities. It is noted that achieving a given final molarity may be more common, causing potential confusion in this situation.
  • #1
bilalarif
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I have been given NiAc and ZnAc solutions of 1M concentration. And being asked to mix the two solutions together in Ni/Zn nominal molar proportions 1%, 3% and 5%. How can I calculate and mix the two solutions to get the required molar proportion.
 
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  • #2
bilalarif said:
calculate and mix the two solutions to get the required molar proportion
Ni/Zn = 0.01, 0.03, and 0.05. Calculate it and do it.
 
  • #3
Bystander said:
Ni/Zn = 0.01, 0.03, and 0.05. Calculate it and do it.

Molar fraction = (number of moles of component of interest) ÷ (total number of moles of mixture)

For Ni/Zn nominal proportion 1%
0.01= number of moles of Ni/ total number of moles of Ni+Zn
Suppose we have total moles of (Ni+Zn) solution= 5 mmol
0.01= moles of Ni/ 5mmol
Moles of Ni = 0.05 mmol
Moles of Zn= total moles of (Ni+Zn)- moles of Ni
Moles of Zn= 4.95 moles
As both NiAc and ZnAc concentration is 1M.
M=n/V
V (ZnAc solution) = 4.95mmole/1 mol/l = 4.95ml

V (NiAc solution) = 0.05mmole/1 mol/l = 0.05ml

is it correct calculation?
 
Last edited:
  • #4
That's one. Two to go.
 
  • #5
No it isn't, though the error is small. You have made a solution which is 0.01 M Ni, but that is not what was asked for. It is not quite 1M Zn any more, so 1 % is not exactly the molar proportion.
If the starting molarities are equal an you are asked for a 1 % ratio you just mix them in the ratio 100:1.
You're probably so used to problems of achieving a given final molarity that you have overthught this one
 
  • #6
Divalent ions, one to one.
 

Related to Calculating and Mixing NiAc and ZnAc Solutions for Molar Proportion

1. What is a simple molar ratio problem?

A simple molar ratio problem is a type of chemistry problem that involves calculating the ratio of moles of one substance to another in a chemical reaction. It is a fundamental concept in stoichiometry, which is the study of the quantitative relationships between reactants and products in a chemical reaction.

2. How do you solve a simple molar ratio problem?

To solve a simple molar ratio problem, you first need to write out the balanced chemical equation for the reaction. Then, you use the coefficients in the equation to determine the mole-to-mole ratio between the substances involved. Finally, you can use this ratio to calculate the number of moles of the desired substance, given the number of moles of the starting substance.

3. Why is understanding molar ratios important in chemistry?

Understanding molar ratios is important in chemistry because it allows us to accurately predict the amounts of reactants needed and products formed in a chemical reaction. This is crucial in industries such as pharmaceuticals, where precise measurements are necessary for effective production.

4. What are some common mistakes made when solving simple molar ratio problems?

Some common mistakes made when solving simple molar ratio problems include forgetting to balance the chemical equation, using incorrect units for molar masses, and mixing up the mole-to-mole ratio with the mole-to-mass ratio. It is important to double-check all calculations and ensure that the units are consistent throughout the problem.

5. How does understanding molar ratios relate to the concept of limiting reactants?

Understanding molar ratios is closely related to the concept of limiting reactants. The mole-to-mole ratio between reactants in a chemical reaction can help determine which reactant will be completely used up and which will be left in excess. This allows us to accurately predict the maximum amount of product that can be formed and identify the limiting reactant.

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