Making a Standard Solution

1. Add the primary standard to a weighing bottle and weigh accurately.2. Transfer as much as possible of the primary standard to a clean beaker and reweigh the weighing bottle.3. Add about 100cm³ of deionised water to the beaker and stir with a stirring rod until all the substance has dissolved.4. Remove the stirring rod washing any traces of the solution on the stirring rod into the beaker with a wash bottle full of deionised water.5. Place a funnel in the neck of a volumetric flask and pour the solution from the beaker into the flask.6. Rinse inside the beaker several times and transfer the washings to the volumetric flask. Rinse the funnel into the flask and remove the funnel.7. Add deionised water to the flask and make up exactly to the graduation mark.8. Stopper the flask and invert several times to make a uniform solution.9. The mass of substance is given by mass of weighing bottle + substance - mass of reweighed bottle without substance.10. The concentration of the solution is given by mass of substance ÷(M_r × volume of solution).