I\'m doing an experiment where you titrate an acid form of an unknown salt with

Question

I'm doing an experiment where you titrate an acid form of an unknown salt with a known concentration of NaOH. I need to determine which salt mine is (either sodium nitrate, sodium sulphate or sodium chloride). It was peformed using an ion-exchange reaction using a resin. The resin was initially bonded to a sodium cation, but we primed it with HCl to give it a hydrogen cation which enables the ion-exchange between the resin and the salt later in the experiment. I did three titrations which had the following amounts of base required to fully titrate the acids: 34.50mL, 34.50mL and 34.60mL. Apparenlty you can only determine the answer using equivalents. Can someone help me determine which salt is mine?

The amount of initial salt was 0.20002g

You place this in 100mL of water, completely dissolve it, then you run some of the dissolved salt/water aliquot down the resin column (10mL aliquots for each trial).

Explanation / Answer

The salt initially taken = 0.2002 in 100mL of water

we need initial concentration of NaOH for calculation

Let initial concentration = N1

so equivalents of NaOH used = concentrationx X volume = N1 X 34.55 mL

So equivalents of acid = N1 X 34.53 mL

Now number of equivalents = Mass of acid / equivalent weight of acid

we have mass of acid so we can determine the equivalent weight directly.

Hope it will help you

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