How to Prepare 500 mL of 5 w/v NaCl Solution: A Comprehensive Guide

Introduction

Preparing a 5 w/v (weight/volume) sodium chloride (NaCl) solution involves a straightforward process that requires accurate measurements and careful stirring. This article provides a detailed guide on how to prepare a 500 mL of 5 w/v NaCl solution, as well as a similar 300 mL solution. Both solutions provide fundamental support for various experimental and industrial applications.

Understanding 5 w/v NaCl Solution

A 5 w/v NaCl solution contains 5 grams of NaCl per 100 mL of solution. To prepare 500 mL of this solution, you need to calculate the appropriate amount of NaCl and follow a series of steps to achieve the desired concentration.

Calculation and Materials Needed

500 mL of 5 w/v NaCl Solution

First, determine the amount of NaCl required.

Calculation:

5 w/v 5 g of NaCl/100 ml of solution Therefore, in 500 ml of solution, you need 5 x 5 g 25 g

Materials Needed:

Sodium chloride (NaCl): 25 g Distilled water: 500 ml A balance: for weighing NaCl A 500 ml volumetric flask or graduated cylinder: for solution preparation A stirring rod or magnetic stirrer: for mixing the NaCl into the water

Steps to Prepare the Solution

Weigh the NaCl: Measure out 25 grams of sodium chloride using a balance. Dissolve in water: Add 25 g of NaCl to a small volume of distilled water, about 200-300 ml, in a beaker or flask. Stir the solution until the NaCl is completely dissolved. Transfer to volumetric flask: Pour the dissolved NaCl solution into a 500 ml volumetric flask or graduated cylinder. Add distilled water: Add distilled water to the flask until the total volume reaches 500 ml. Make sure to add water gradually and mix well. Mix thoroughly: Ensure the solution is well mixed.

Final Note: Label the solution with the concentration and date. Store it properly for future use.

Preparing 300 mL of 5 w/v NaCl

The solubility of NaCl in water at 25 deg. C is 360 g/L. A 5 w/v NaCl solution contains 5 g of NaCl in 100 ml of solution. For 300 ml, you need 15 g of NaCl.

Preparation of 300 mL of 5 w/v NaCl Solution

Weigh out NaCl: Weigh out 15 g of pure NaCl in a glass beaker using a top balance or a fine chemical balance if accuracy is required. Dissolve the NaCl: Add some 100 ml of distilled or deionised water to the beaker and mix the NaCl gently with a clean glass rod to further dissolve the salt. Transfer the solution: Transfer the solution to a 300 ml volumetric flask with the help of the glass rod. Consult and transfer rinseings: Rinse the beaker and glass rod with another 100 ml of distilled or deionised water and transfer the washings to the flask. Top up the solution: Top up the flask with more distilled or deionised water until just below the graduation mark. Then top up to the graduation mark with more distilled or deionised water with a dropper. Mix thoroughly: Stopper the flask well, hold onto the stopper, and carefully invert the flask several times to mix the solution. Final Note: This results in your 300 mL of 5 w/v NaCl solution.