Preparation of 5M potassium acetate

To prepare 5M potassium acetate solution, it is necessary to explain the steps. First prepare the required materials and medicines, there are accurate balances, clean volumetric bottles, stirring rods, beakers, etc. For medicine, potassium acetate solids are also.

First accurately weigh an appropriate amount of potassium acetate solids with a balance. According to the formula $n = cV $ ($n $is the amount of substance, $c $is the concentration of the solution to be prepared, $V $is the volume of the solution to be prepared), if 1L of 5M potassium acetate solution is to be prepared, the amount of potassium acetate is $n = 5mol/L × 1L = 5mol $, and the molar mass of potassium acetate ($CH_3COOK $) is about 98g/mol, so it is necessary to weigh the potassium acetate mass $m = nM = 5mol × 98g/mol = 490g $.

Place the weighed potassium acetate solid in a clean beaker, add an appropriate amount of distilled water, and stir it lightly with a stirring rod to promote its dissolution. Be careful not to add too much water, so that the solid can be initially dissolved.

After the potassium acetate solid is fully dissolved, slowly inject the resulting solution into a volumetric bottle of appropriate specifications along the glass rod. Wash the beaker and glass rod 2-3 times with a small amount of distilled water, and the lotion is also injected into the volumetric bottle to ensure that the solute is intact.

Then add distilled water to the volumetric bottle to a place close to the scale line 1-2cm, and use a rubber head dropper to add water dropwise until the concave liquid surface of the solution is tangent to the scale line. Cover the volumetric bottle, turn it upside down repeatedly, and shake well.

In this way, the preparation of 5M potassium acetate solution is completed. During the preparation process, be sure to pay attention to the specifications of the operation to ensure the accuracy of the solution concentration.