contestada

To find the mass percent of dolomite [CaMg(CO₃)₂] in a soil sample, a geochemist titrates 13.86 g of soil with 33.56 mL of 0.2516 M HCl. What is the mass percent of dolomite in the soil?

Respuesta :

The mass percent of dolomite [CaMg(CO₃)₂] in the soil is 2.81 percent.

Steps

Equation

CaMg(CO₃)₂+ 4HCL--> CaCl2+ 2H2CO₃

V(HCl)=33.56mL

c(HCl)=0.2516M

n(HCl)=c x V=8,44mmol

n{CaMg(CO₃)₂}= 1/4 x n(HCl)= 2.11mmol

m{CaMg(CO₃)₂} = n x Mr=0.3893g

mass percent(dolomite)= [tex]\dfrac{m(dolomite)}{m(sample)}[/tex] x 100

mass percent(dolomite)=[tex]\dfrac{0.3893}{13.86} * 100[/tex]

mass percent(dolomite)=2.81 percent

The mass percent of dolomite in the soil is 2.81 percent

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How can you determine a compound's mass percent?

To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.

learn more about mass percent here

https://brainly.com/question/26150306

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