Question

Prepare m/20 solution of oxcilicp

Answer 1

Take a watch glass, wash it with distilled water and then dry it.

Weigh the clean and dried watch glass accurately and record its weight in the note book.


Weigh 3.150 g oxalic acid on the watch glass accurately and record this weight in the note-book.

Transfer gently and carefully thsmle oxalic acid from the watch glass into a clean 250 beaker. Wash the watch glass with distilled water with the help of a wash bottle to transfer the particles sticking to it into the beaker [Fig].
The volume of distilled water for this purpose should not be more than 50 ml.

Dissolve oxalic acid crystals in the beaker by gentle stirring with a clean glass rod.

When the oxalic acid in the beaker is completely dissolved, transfer carefully the entire solution from the beaker into a 250 ml measuring flask (volumetric flask) with the help of a funnel [Fig].


Wash the beaker with distilled water. Transfer the washings into the measuring flask [Fig].

Finally wash the funnel well with distilled water with the help of a wash bottle to transfer the solution sticking to the funnel into the measuring flask [Fig].

Add enough distilled water to the measuring flask carefully, up to just below the etched mark on it, with the help of a wash bottle.

Add the last few drops of distilled water with a pipette until the lower level of the meniscus just touches the mark on the measuring flask [Fig].

Stopper the measuring flask and shake gently to make the solution uniform through-out. Label it as oxalic acid solution.