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UkoKoshka [18]
3 years ago
13

Balance the equation and state the limiting reagent in the following reaction:

Chemistry
1 answer:
romanna [79]3 years ago
8 0
Hgffvvcbchcgivigcigxgsgixigdfhcgcc fcfuc
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A 0.500-g sample containing Na2CO3 plus inert matter is analyzed by adding 50.0 mL of 0.100 M HCl, a slight excess, boiling to r
Yakvenalex [24]

The percentage by mass of Na2CO3 in the sample is 48%.

The equation of the reaction of Na2CO3 with HCl;

Na2CO3(aq) + 2HCl(aq) ------> 2NaCl(aq) + H2O(l) + CO2(g)

Since the HCl is in excess, the excess is back titrated with NaOH as follows;

NaOH (aq) + HCl(aq) ---->NaCl(aq) + H2O(l)

Number of moles of HCl added =  0.100 M × 50/1000 L = 0.005 moles

Number of moles of NaOH added = 5.6/1000 ×  0.100 M = 0.00056 moles

Since the reaction of NaOH and NaOH is 1:1, 0.00056 moles of HCl reacted with excess HCl.

Amount of HCl that reacted with Na2CO3 =  0.005 moles -  0.00056 moles = 0.0044 moles

Now;

1 mole of Na2CO3 reacts with 2 moles of HCl

x moles of Na2CO3 reacts with 0.0044 moles of HCl

x = 1 mole × 0.0044 moles / 2 moles

x = 0.0022 moles

Mass of Na2CO3 reacted = 0.0022 moles × 106 g/mol = 0.24 g

Percentage of Na2CO3  in the sample = 0.24 g/ 0.500-g × 100/1 = 48%

Learn more about back titration: brainly.com/question/25485091

5 0
2 years ago
Potassium (K) and calcium fluoride (CaF2) can both be classified as<br> (Please help)
nasty-shy [4]
Potassium and calcium fluoride are both metals
8 0
3 years ago
How much of a 10 M solution is needed to make 1 liter of a 1 M solution
mylen [45]

Answer:

0.1 L

Explanation:

M₁ × V₁ = M₂ × V₂

10M × V₁ = 1M × 1L

V₁ = 0.1 L

I hope this helps :)

5 0
3 years ago
A ____ is the remains of a once-living organism found in layers of rocks, ice, or amber
aksik [14]

Answer:

fossil

Explanation:

the dead organism is called a fossil i think

8 0
2 years ago
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How many grams of O are in 675 g of Na2O
PIT_PIT [208]
I think it is .00005815
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3 years ago
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