# Determining Volume of Base for ASA Experiment

• Mary1910
In summary, the conversation discusses an experiment to determine the mass of ASA using a titration method. The relevant information from the experiment includes the Ka value of ASA, the mass of an ASA tablet, and the use of a standardized NaOH solution. The conversation also provides relevant equations and an attempt at calculating the volume of base needed for the titration. The calculations appear to be correct, but it is suggested to be more precise in stating the purpose of the calculation.
Mary1910
1. Homework Statement .
This question is based on an experiment to determine the mass of ASA.
Information from the experiment :
• ASA is a weak acid with a Ka value of 3.2 x 10^-4.
• An ASA tablet has an approximate mass of 500 g.
• The experiment used a titration with a standardized 0.100 mol/L NaOH.

The balanced equation is HC9H7O4(aq) + NaOH(aq) -> NaC9H7O4(aq) + H2O(l)

a) What volume of base will you substitute into the formula when you calculate the number of moles of base used?

2. Relevant equations.

n=m/M

v=n/c

3. The attempt at the solution

First determine molar mass of HC9H7O4
=180.17 g/mol

n=m/M
=(0.500g ) / (180.17g/mol)
=2.78 x 10^-3 mol

v=n/c
=(2.78 x 10^-3) / (0.1mol/L)
=0.0278 mL
=27.8 L

Could someone let me know if I determined the volume of the base correctly? Thanks.

Mary1910 said:
=(2.78 x 10^-3) / (0.1mol/L)
=0.0278 mL
=27.8 L

You mixed up units in the last two lines, but - assuming you meant L first, mL second - your calculations look OK.

But it wouldn't hurt to write more precisely what you are calculating. I am guessing you are checking what should be approximate volume of the base required to titrate ASA from a single tablet, but it doesn't necessarily follow from your post.

Thanks, and sorry for my lack of clarity.

Borek

## 1. How is the volume of base determined in an ASA experiment?

The volume of base is determined by measuring the amount of base needed to neutralize an acidic solution, which can be done using a burette or a graduated cylinder.

## 2. What is the purpose of determining the volume of base in an ASA experiment?

The purpose of determining the volume of base is to accurately determine the concentration of the acidic solution being tested. This information can then be used to calculate other important parameters, such as the molarity of the acid.

## 3. What are the key factors that can affect the accuracy of determining the volume of base in an ASA experiment?

The key factors that can affect the accuracy of determining the volume of base include human error in measuring and recording volumes, air bubbles in the burette or graduated cylinder, and incorrect calibration of equipment.

## 4. How can the accuracy of determining the volume of base be improved in an ASA experiment?

The accuracy of determining the volume of base can be improved by using precise measuring equipment, taking multiple measurements and calculating an average, and ensuring that the equipment is properly calibrated.

## 5. Are there any safety considerations when determining the volume of base in an ASA experiment?

Yes, it is important to handle the acidic and basic solutions with caution and wear appropriate protective equipment, such as gloves and goggles. It is also important to properly dispose of any waste solutions to avoid contamination and potential hazards.

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