preparing a standard solution

Question 1

what is step one when preparing a standard solution

Answer 1

• work out the mass of the solid required and weigh it out accurately

Question 2

what is step two when preparing a standard solution

Answer 2

• dissolve the solid in a beaker using the minimum amount of distilled water

Question 3

what is step three when preparing a standard solution

Answer 3

• transfer the solution carefully into the volumetric flask using a funnel, rinse the glass rod with distilled water into the flask

Question 4

what is step four when preparing a standard solution

Answer 4

• rinse the beaker and funnel carefully with distilled water into the flask

Question 5

what is step five when preparing a standard solution

Answer 5

• remove the funnel and add distilled water slowly using a dropping pipette until the bottom of the meniscus sits at the graduation line

Question 6

what is step six when preparing a standard solution

Answer 6

• place the stopper on the flask and invert several times to mix

Question 7

what are some procedural errors when preparing a standard solution

Answer 7

• filling the flask above the graduation line
• not inverting the flask to mix

Question 8

what happens if the flask is filled above the graduation line

Answer 8

• the solution will be less concentrated than required and it will have to be discarded and made up again

Question 9

what happens if the flask is not inverted when mixing

Answer 9

• the concentration inside the flask will vary and it will be more concentrated at the bottom of the flask and less concentrated at the top of the fask

Question 10

what is a standard solution

Answer 10

• a solution of known concentration

Question 11

what is a volumetric flask

Answer 11

• measures a fixed volume of solution filled so the bottom of the meniscus sits on the graduation line