A1.50 g sample of an unknown alkali metal carbonate was dissolved in water, and 31.10 ml of 0.350 m cacl₂ was required to precipiate all the carbonate ions as caco₃. what is the name and formula of the unknown compound?

Answer : The formula of unknown compound is and the name of the compound is potassium carbonate.

Explanation :

First we have to calculate the moles of

Now we have to calculate the moles of unknown alkali metal carbonate.

Let the alkali metal be, 'M'.

The balanced chemical reaction will be:

From the balanced reaction we conclude that,

As, 1 moles of react with 1 mole of

So, 0.0109 moles of react with 0.0109 mole of

Now we have to calculate the molar mass of unknown alkali metal carbonate.

Thus, the molar mass of is 137.6 g/mole

Now we have to calculate the mass of alkali metal.

Thus, we conclude that the alkali metal will be potassium (K) that has 38.8 grams of mass.

So, the formula of unknown compound is and the name of the compound is potassium carbonate.

it would be d. henry moseley

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