Chem test 2 grade 10 (titration)

Question 1

thing that holds buret, etc

Answer 1

stand

Question 2

claw

Answer 2

clamp

Question 3

thing that connects the clamp to the stand

Answer 3

boss

Question 4

thing that holds the liquid
held by the stand

Answer 4

buret

Question 5

thing that allows you to pour liquid without spilling

Answer 5

funnel

Question 6

thing that allows you to suck up a precise amount of liquid

Answer 6

pipet

Question 7

thing that you pour chemicals into

Answer 7

cup

Question 8

triangle

Answer 8

moles/volume x concentration

Question 9

what liquid goes in the buret

Answer 9

titrant

Question 10

what liquid goes in the erlenmeyer flask

Answer 10

sample

Question 11

cup thing that sample goes in

Answer 11

erlenmeyer flask

Question 12

how to calculate concentration

Answer 12

-write
c c
n n
v v
under chemicals with the correct formula
- then put in information you know (the two volumes and the concentration of one of them)
-then calculate the moles of one
- use the molar ratio to multiply the amount of moles with
- do moles/volume to find concentration of the other chemical

Question 13

table

Answer 13

trial, start point, end point, observations, titration volume, NaOH mmols, H2SO4 mmols, concentration of H2SO4

make sure to add the measure of uncertainty

Question 14

raw data

Answer 14

data gotten from experiment

Question 15

processed data

Answer 15

data found from calculations

Question 16

percentage error

Answer 16

used to express the difference between experimental results and the accepted value

Question 17

how to find percentage error

Answer 17

/experimental result-accepted value/ /accepted value x 100%

Question 18

how to write percentage error

Answer 18

in conclusion, state magnitude (number) and direction (higher or lower)

Question 19

percentage error example

Answer 19

my results (0.6825M) were 2.5% lower than the accepted value (0.7M)

Question 20

what is titration

Answer 20

Titration is an analytical technique that is used to determine the concentration of a
solution using stoichiometry.

Question 21

round thing that goes with the pipette

Answer 21

bulb filler

Question 22

thing that gives the chemicals its color

Answer 22

universal indicator

Question 23

steps of titration

Answer 23

-get all materials
- pour your acid into a cup
- with the pipette and bulb filler, measure 10ml and drop it into the Erlenmeyer (glass to glass, 45 degree angle, use finger to not tap)
- put universal indicator into acid
- fill buret until it is between 1 and 5
- slowly drop the titrant into the sample until the color changes to green.
- if it is blue then it went too far
- measure the titrated volume (end point - start point)
- do calculations

Question 24

measure of uncertainty of titrated volume

Answer 24

measure of uncertainty of end point + start point.

two decimal points

0.05 +0.05 = 0.10

Question 25

How to use pipette

Answer 25

Prepare equipment: Pipette, Bulb filler, Beaker, Solution, Erlenmeyer. Draw in solution (press A, then S) Measure exact volume (press E) Dispense solution (press E)

Question 26

How to start the titration experiment

Answer 26

Prepare equipment (pipette, bulb filler, beaker with solution, erlenmeyer) 2) Draw in solution Press A and bulb to create a vacuum. Press S to draw in solution. 3) Measure exact volume Hold pipette vertical, beaker at 45º angle Press (E) to slowly release solution until markline. 4) Dispense solution Pipette vertical, beaker at 45º angle. Press E. Wait 10 seconds. Remove pipette without ticking.

Question 27

How to read a buret

Answer 27

the dip in the cup of the solution

Question 28

grams to moles

Answer 28

divide by molar mass

Question 29

moles to grams

Answer 29

multiply by molar mass

Question 30

how to solve when we have two solutions (dilution)

Answer 30

M1 x V1 = M2 x V2 Where M1 is initial concentration and V1 is initial volume Where M2 is final concentration and V2 is final volume

Question 31

How to find molar mass of a solute

Answer 31

recognize that moles = concentration x volume realize that molar mass is g/mol do the grams / the amount of mol you calculated

Question 32

L to ml

Answer 32

multiply by 1000

Question 33

ml to L

Answer 33

divide by 1000

Question 34

conclusion (4)

Answer 34

State the final result State the goal of the experiment Describe in a few sentences how the goal was achieved (overview of method) Calculate and use the percent error

Question 35

evaluation (2)

Answer 35

Evaluate the accuracy of the data Evaluate the precision of the data