Answer:
The open system evaporates the solvent in the solution
Explanation:
An open system is a system in which exchange of materials and energy can occur. If a TLC set up is left open, then the set up constitutes an open system.
During TLC, the sample is dotted on the plate and inserted into a suitable solvent. The solvent moves up the plate and achieves the required separation of the mixture.
Most of these solvents used used TLC are volatile organic compounds. Therefore, if the TLC set up is left open, the solvent will evaporate leading to poor results after running the TLC experiment.
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The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
<h3>HOW TO CALCULATE MASS?</h3>
The mass of a substance can be calculated by multiplying the number of moles by its molar mass.
However, the number of moles must first be calculated by using the following expression:
Molarity = no. of moles ÷ volume
no. of moles = 0.249 × 0.1208
no. of moles = 0.03moles
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mass of NaCl = 0.03 × 58.5 = 1.76g
Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.
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