Finding volume using Molarity + Equation

In summary, the task is to determine the volume in mL of 0.0138 M Na2S2O3 needed to dissolve 0.250 g of AgBr in the photographic process. The equation for this process is AgBr (s) + Na2S2O3 (aq) → Na3Ag(S2O3)2 (aq) + NaBr (aq). The solution involves using the definition of molarity and converting units, and the resulting volume is 194 mL according to the answer sheet. However, there may be slight variations in the answer due to different molar masses used.
  • #1
ballinbob
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Homework Statement



In the photographic process silver bromide is dissolved by adding sodium thiosulfate. Determine the volume in mL of 0.0138 M Na2S2O3 should be added to dissolve 0.250 g of AgBr.

Homework Equations



The equation is : AgBr (s) + Na2S2O3 (aq) → Na3Ag(S2O3)2 (aq) + NaBr (aq)

The Attempt at a Solution



I know your supposed to use the definition of molarity and do some conversions, but it would never turn out right. The answer sheet says the answer is 194 mL.

Thanks everyone
 
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  • #2
Show how you are doing it. I got 193 mL - most likely because of the slightly different molar masses used.
 

1. How do you calculate the volume using molarity and equation?

The volume can be calculated by dividing the given amount of solute (in moles) by the molarity (in mol/L). This equation can be written as V = n/M, where V represents volume, n represents moles, and M represents molarity.

2. What is molarity and why is it important in finding volume?

Molarity is a unit of concentration that represents the number of moles of solute per liter of solution. It is important in finding volume because it allows us to convert between the amount of solute (in moles) and the volume of the solution (in liters).

3. Can you use any unit of measurement for molarity and volume?

No, molarity must be expressed in units of mol/L and volume must be expressed in units of liters in order for the equation to work correctly.

4. Is there a specific formula for calculating molarity?

Yes, the formula for molarity is M = n/V, where M represents molarity, n represents moles, and V represents volume.

5. How does the concept of molarity and volume relate to the concentration of a solution?

Molarity and volume are directly related to the concentration of a solution. As the molarity increases, the concentration of the solution also increases. Similarly, as the volume increases, the concentration decreases.

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