Question

How do you determine mmols of acid and the mg of CO2 with this set of data?

Density Determination 25-ml beaker with 5-ml Empty 25-ml Na2CO3 beaker (g) solution (g) 32.081 37.238 25.363 30.519 30.875 36.031 25.072 30.229 31.006 36.162 29.951 35.108 Limiting Reactant Plot 25-ml 25-ml Empty 25-ml Erlenmeyer Erlenmeyer flask Erlenmeyer flask flask with with final (g) acid (g) mixture (g) 26.713 26.779 31.914 30.142 30.274 35.408 30.572 30.605 35.751 32.312 32.509 37.643 31.707 31.729 36.878 26.163 26.262 31.395

Answer 1

Na2CO3 + 2 HCl $\rightarrow$ 2 NaCl + H2O + CO2

To calculate milli moles of acid (HCl)

For trail 1:

moles = mass of acid / molar mass

Molar mass of acid (HCl) = 36.5 g/mol

Mass of acid = mass of erlenmeyer flask with acid - mass of empty erlenmeyer flask

= 26.779 - 26.713

= 0.066 moles

1 mole = 1000 milli moles

Milli moles of acid = 66 milli moles

As acid is limiting reagent so it will determine the amount of product formed.

According to above balanced reaction

2 moles of acid react to form 1 mole of CO2

0.066 mole of acid react to form (1 x 0.066)/2

= 0.033 mole of CO2

Mass = moles x molar mass

Molar mass of CO2 = 44 g/mol

Mass of CO2 = 44 x 0.033

= 1.452 g = 1452 mg of CO2