Chm Laboratory Essay

Just how much Sodium Bicarbonate Is In the Mixture?

Lab Research 14

Biochemistry 113 Lab

10/13/2011

1) Method one particular: Adding acidity

NaHCO3 + HCl → NaCl + CO2 & H2O

a) Unknown combination of NaCl and NaHCO3

Mass of unidentified mixture (NaCl + NaHCO3)| 3 g

Mass of HCl| 31. 31g

Mass of products ( NaCl & H2O )| 26. 98 g

Compute mass of CO2| 6th. 33g

Estimate mass of NaHCO3| doze. 1 g

i) Calculations:

Mass of CO2 sama dengan

[Mass of unknown mixture (NaCl + NaHCO3) + Mass of HCl ] – [Mass of NaCl + H2O] sama dengan (3 g + 31. 31 g) – 21. 98 g = 6. 33g

Mass of NaHCO3:

6. 33 g CO2 2. 1 mol CO2 forty-four. 10 g CO2 2. 1 mol NaHCO3 1 mol CO2 *84. twenty g NaHCO3 1mol NaHCO3 =12. you g NaHCO3

b) Chastity sodium bicarbonate

Mass of NaHCO3| 3 g

Mass of HCl| 30 g

Mass of products ( NaCl + INGESTING WATER )| dua puluh enam. 81 g

Calculate mass of CO2| 6. 19 g

Assumptive mass of NaHCO3| 10. 8 g

i) Calculations:

Mass of CO2 sama dengan ( Mass of NaHCO3 + Mass of HCl ) – ( Mass of NaCl + WATER ) = (3 g + 35 g ) – twenty six. 81 g = six. 19 g

Assumptive mass of NaHCO3:

6th. 19 g CO2 5. 1 mol CO2 44. 10 g CO2 * 1 mol NaHCO3 one particular mol LASER *84. twenty g NaHCO3 1mol NaHCO3 =11. almost 8 g NaHCO3

2) Method 2: Warming

2NaHCO3→Na2CO3+CO2+H2O

a) Experimental benefits

i) Trial 1

Mass of NaHCO3| 0. 3g

Temperature of hot plate| 400 ˚C

Time interval| 10 minutes.

Mass of mini beaker and product (Na2CO3)| 31. 3g

Mass of mini beaker| 31. 21g

Final mass of Na2CO3| 0. 09g

ii) Trial 2

Mass of NaHCO3| zero. 3g

Temperatures of sizzling plate| four hundred ˚C

Period interval| 10 min.

Mass of tiny beaker and product (Na2CO3)| 31. 52g

Mass of mini beaker| 31. 31g

Final mass of Na2CO3| 0. 21g

iii) Normal mass of Na2CO3

(0. 09 g + zero. 21 g) / 2 = 0. 15 g

b) Theoretical results

i) Trial 1

0. 3g NaHCO3 * 1mol NaHCO384. 0062g NaHCO3 5. 1 mol Na2CO32 mol NaHCO3 2. 105. 99g Na2CO31 mol Na2CO3 = 0. 19g Na2CO3 2) Trial two

zero. 3g NaHCO3 * 1mol NaHCO384. 0062g NaHCO3 2. 1 mol Na2CO32 mol NaHCO3 * 105. 99g Na2CO31 mol Na2CO3...



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