Using micropipettes for delivery of small volumes pg 5-8

1. if you need to pipette x µl, which micropipette/pipetman would you use?

2. how do you use a micropipette?

3. if you pipette xµl onto a tared weigh boat, what weight should you get in grams? and why?

4. being able to read what micropipettes are set to (pg 6)

5. when would you use a pipet-aid vs a pipetman

6. when should you switch your tip?

7. how do you use the analytical balance?

a electronegativity decreases beacuse the size of nucleus is bigger.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2