Moles of na2co3 in sample from mol co2 generated 2 mass of...

Name: moles of na2co3 in sample from mol co2 generated 2 mass of na2co3 in sample g 3 mass of original sample g 4 percent na2co3 in sample 5 average percent na2co3 in sample 21308
Uploaded: 2022-07-01T00:03:43-08:00
Duration: 1 min 26 s
Channel: Rachel Towne
Description: moles of na2co3 in sample from mol co2 generated 2 mass of na2co3 in sample g 3 mass of original sample g 4 percent na2co3 in sample 5 average percent na2co3 in sample 21308

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Finding the Percent Na2CO3 in Sample Trial 1 Trial 2 1. Moles of Na2CO3 in sample from mol CO2 generated 2. Mass of Na2CO3 in sample (g) 3. Mass of original sample (g) 4. Percent Na2CO3 in sample (%) 5. Average percent Na2CO3 in sample (%)

Rachel T.

Mass data for reaction of NaHCO3-Na2CO3 mixture with HCl Mass of crucible and cover (g): 28.8258 Mass of crucible, cover, and mixture (g): 29.4948 Mass of crucible, cover, and residue after reaction with HCl (g): 1st weighing... 29.4454 2nd weighing... 29.4455 Calculation of percent NaHCO3 and Na2CO3 in an unknown mixture. mass of unknown mixture used (g) mass of NaCl formed (g) Mass of NaHCO3 in unknown mixture (g) Mass of Na2CO3 in unknown mixture (g) Percent of NaHCO3 by mass in unknown mixture (%) Percent of Na2CO3 by mass in unknown mixture (%) Average percent by mass of other elements in unknown sample (%) Write 2 mathematical equations using the experimental quantities of your experiment. You must remember that both equations must have identical units on both sides of the equation. 1. Mass of mixture = mass NaHCO3 + Mass Na2CO3 2. Moles NaCl = 2(moles Na2CO3) + 1(mol NaHCO3) 3. mass NaHCO3 = mass mixture - Na2CO3 Given: MW Na2CO3 = 105.98 g/mol MW NaCl = 58.44 g/mol MW NaHCO3 = 84.01 g/mol Mass of mixture = ? Mass of NaCl = ? SOLVE the 2 equations and calculate the mass of NaHCO3 and the mass of Na2CO3. Calculate the percent NaHCO3 by mass in the unknown mixture, calculate the percent Na2CO3 by mass in the unknown mixture, and the average percent by mass of other elements in the unknown sample (%)

Suman K.

Based on an unknown sample containing a certain percentage of Na2CO3, you will determine the percentage of Na2CO3 in the unknown sample through titration. Based on the information below, fill in the empty spaces in the table: (Quality Control Sample) Labeled percentage of Na2CO3 = 53% Mass of weighed QC sample = 1.0021 g (in 100 mL) What is the mass of the Quality Control sample in the 25.00 mL aliquot = ? trial 1 trial 2 trial 3 Volume of HCl titrated 23 mL 23.2 mL 23.1 mL Moles of HCl required for titration Moles of Na2CO3 in 25 mL aliquot Mass of Na2CO3 in 25 mL aliquot Percentage of Na2CO3 in 25 mL aliquot

Shaiju T.

Transcript

00:03 In order to solve this problem, we need to start with a balanced chemical reaction.

00:08 It didn't see one in the problem, so here is one for reference.

00:12 We see that in this particular reaction, na2 -co3 and co2 reaction a 1 -1 -mole ratio.

00:22 This means the moles of na2 -co3 will be the same as the moles of co2 generated.

00:28 For our purposes, let's say it's 0 .75 moles, na2 -co3.

00:35 Now we can solve for grams of n .a2 co3 using the molar mass...

Question

Moles of Na2CO3 in sample from mol CO2 generated 2. Mass of Na2CO3 in sample (g) 3. Mass of original sample (g) 4. Percent Na2CO3 in sample (%) 5. Average percent Na2CO3 in sample (%)

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