Hi
This is probably a really lame request but can any tell me how to make
0.1M Salicylic Acid, Abscisic Acid and Ethylene I cant find the recipes anywhere.
Thanks for your help.
Nicky
How to make salicylic Acid
- Lis
- Posts: 362
- Joined: 01 Jun 2006, 10:00
- Job Title: Laboratory Technician
- School: Central Coast Grammar
- Suburb: Erina Heights
- State/Location: NSW
Hi Nicky,
if you use the formula
m(mass g)=FWxn(no of moles)
or- moles= mass(g)
FW
or -n= m
FW
or- n
m =FW
or- FWxn=n
for salicylic acid the equation would be ;
m = 138.12 x 0.1
m= 13.812g/L
ascorbic acid is
m= 176.13x0.1
m=17.613g/L
hope this has helped, you can use the same formula for all concentrations, just remember answers are in grams/L
the FW or MW is on the front of the bottle/jar
cheers Lisa
if you use the formula
m(mass g)=FWxn(no of moles)
or- moles= mass(g)
FW
or -n= m
FW
or- n
m =FW
or- FWxn=n
for salicylic acid the equation would be ;
m = 138.12 x 0.1
m= 13.812g/L
ascorbic acid is
m= 176.13x0.1
m=17.613g/L
hope this has helped, you can use the same formula for all concentrations, just remember answers are in grams/L
the FW or MW is on the front of the bottle/jar
cheers Lisa
The easiest way to calculate mass of substrate to make solution of any molarity use formula
m = M x Mr x V
where:
m is mass in grams
M is concentration of the solution
Mr is molecular weight
V is volume in Litres of solution
Example :
Mr of Salicylic acid is 138.12
Desired molarity is 0.1M
And you need 0.5L
138.12x0.1x0.5=6.90gr
You need 6.7 gr of salicylic acid
Abscisic Acid Mr 264.3 0.1M 0.5L
264.3*0.1*0.5= 13.2gr
Ethylene glycol is little bit different because you usually make in %
The formula for volume percent (v/v) is:
[Volume of solute (ml) / Volume of solution (ml)] x 100
Example: to make 5% by volume of 5% ethylene glycol in water
Express % as a decimal 5% =0.05
Multiply this number with total volume 0.5L
0.05*500mL= 25ml (ethylene glycol needed)
Dissolve 25ml ethylene glycol in a little less than 450ml of water. Now bring final volume of solution up to 500ml with the addition of more water.
(This eliminates any error because the final volume of the solution may not equal the calculated sum of the individual components
m = M x Mr x V
where:
m is mass in grams
M is concentration of the solution
Mr is molecular weight
V is volume in Litres of solution
Example :
Mr of Salicylic acid is 138.12
Desired molarity is 0.1M
And you need 0.5L
138.12x0.1x0.5=6.90gr
You need 6.7 gr of salicylic acid
Abscisic Acid Mr 264.3 0.1M 0.5L
264.3*0.1*0.5= 13.2gr
Ethylene glycol is little bit different because you usually make in %
The formula for volume percent (v/v) is:
[Volume of solute (ml) / Volume of solution (ml)] x 100
Example: to make 5% by volume of 5% ethylene glycol in water
Express % as a decimal 5% =0.05
Multiply this number with total volume 0.5L
0.05*500mL= 25ml (ethylene glycol needed)
Dissolve 25ml ethylene glycol in a little less than 450ml of water. Now bring final volume of solution up to 500ml with the addition of more water.
(This eliminates any error because the final volume of the solution may not equal the calculated sum of the individual components
Cheers Jazz
Thanks Jazz and Lisa, I am new to this game and I panic when I cant find recipes for the solutions. I didnt know whether the salicyclic acid had to be mixed with water or something else like ethanol. So Carol the reason I wanted to know how to make the solution up was because it didnt dissolve very well in water so therefore did not look right. Now, at least I know I did the right calculations.
Cheers Nicky
Cheers Nicky