I have the same question as anonymous person before me so I just copy the question from that person, here is the question please help the two of us!
if you have a mixture of sodium chloride and sodium bromide, could you use its conductance to determine the concentration of each solution? explain
I'm not an expert on conductance but I don't think it could be done. Conductance measurements can be made to determine EITHER concn but not mixture of the two. It is true that the specific conductance is different for Cl and Br ions but I don't think that is sufficient in order to determine the concn of a mixture.
thank you for the help
Certainly! Determining the concentration of sodium chloride (NaCl) and sodium bromide (NaBr) in a mixture can be done by measuring their conductance. To understand how this can be done, let's break down the explanation into a few steps:
Step 1: Understanding Conductivity
Conductivity refers to the ability of an electrolyte solution to conduct an electric current. It depends on the concentration of ions in the solution. Typically, higher ion concentration leads to higher conductivity.
Step 2: Conductivity of Sodium Chloride and Sodium Bromide
Both sodium chloride and sodium bromide dissociate into ions when dissolved in water. NaCl dissociates into sodium ions (Na+) and chloride ions (Cl-), while NaBr dissociates into sodium ions (Na+) and bromide ions (Br-). Since both compounds generate ions, their solutions are conductive.
Step 3: Effects of Concentration on Conductivity
Concentration directly affects the conductivity of an electrolyte solution. Generally, an increase in concentration leads to higher conductance since there are more ions available to conduct an electric current. Similarly, a decrease in concentration results in lower conductance as fewer ions are present.
Step 4: Conductimetric Analysis
To determine the concentration of NaCl and NaBr in a mixture, you can perform a conductimetric analysis. Here's how to proceed:
1. Prepare a series of known concentration solutions of NaCl and NaBr separately. These solutions should cover a range of concentrations to create a calibration curve.
2. Measure the conductance of each known concentration solution using a conductometer or conductivity meter. Note the conductance values.
3. Plot a calibration curve using the known concentration values on the x-axis and the corresponding conductance values on the y-axis for both NaCl and NaBr separately.
4. Now, measure the conductance of the mixture of NaCl and NaBr and note down its value.
5. Using the calibration curves, find the corresponding concentrations of NaCl and NaBr based on the conductance value of the mixture.
Please note that this method assumes that the conductivities of NaCl and NaBr are additive, meaning that the conductance of the mixture is the sum of the conductances of the individual components.
By following these steps, you can estimate the concentration of NaCl and NaBr in the mixture based on their conductance values.