A sample of 3.0600 grams contains a mixture of sodium carbonate and calcium carbonate. This sample was dissolved with 92.81 mL hydrochloric acid, heated to completely remove the reaction gases. After cooling to room temperature, this solution is put in a volumetric flask and diluted to a volume exactly 100.00 mL. This solution is acidic. a. Write down the equation for the ionic reaction in the process of dissolving the sample of the carbonate mixture. The excess acid in the dissolving process is neutralized by alkaline, how: 10.00 mL of the mixed solution is titrated with 0.1072 M sodium hydroxide solution and 37.31 mL is needed to neutralize it properly. b. Write down the equation for this neutralizing reaction.
A sample of 3.0600 grams contains a mixture of sodium carbonate and calcium carbonate. This sample was dissolved with 92.81 mL hydrochloric acid, heated to completely remove the reaction gases. After cooling to room temperature, this solution is put in a volumetric flask and diluted to a volume exactly 100.00 mL. This solution is acidic.
a. Write down the equation for the ionic reaction in the process of dissolving the sample of the carbonate mixture.
The excess acid in the dissolving process is neutralized by alkaline, how: 10.00 mL of the mixed solution is titrated with 0.1072 M sodium hydroxide solution and 37.31 mL is needed to neutralize it properly.
b. Write down the equation for this neutralizing reaction.
The titrated solution is reacted with an excess of ammonium oxalate, (NH4) 2C2O4, to separate the calcium ions. The resulting precipitate was filtered, washed and dried and then weighed as much as 0.2560 g.
c. Write down the equation for the reaction in this calcium separation process.
d. Calculate the calcium ion content in the original sample (expressed in% mass)
The concentration of hydrochloric acid used in the original sample dissolution was determined by using
e. Calculate the concentration of hydrochloric acid solution (express in M) before diluting it.
f. Calculate the excess hydrochloric acid (expressed in moles) for the above sample dissolution process.
g. Calculate the total carbonate ion content (expressed as% -mass) in the original sample.
h. Calculate the mass ratio of sodium carbonate to mass of calcium carbonate in the sample above.
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