Author Topic: bio practical as  (Read 995 times)

Offline winnie101

  • SF Immigrant
  • **
  • Posts: 122
  • Reputation: 1390
bio practical as
« on: May 15, 2010, 02:35:01 pm »
could someone plz explain to me how to make the solutions for june 2009 practical 32. and ques 2b how do i calculate the area of the field of view. i dont get anything from the marking scheme.
plz and thank u
any tips on wat to study is welcome

Offline Sue T

  • SF Citizen
  • ***
  • Posts: 171
  • Reputation: 5415
  • Gender: Female
Re: bio practical as
« Reply #1 on: May 17, 2010, 01:35:11 pm »
u can take 0cm3 water, 10 cm3 salt , <the percentage conc is identical cuz its = (10/100) * (salt/water)>
th last column is simplt dividin by 2
 
then take 7.5water & 2.5 salt
then 2.5 water n 7.5 salt
then 2.5 water n 7.5 salt

there u go the readings are equally spaced + 3 readings are enough (i guess)

i wrote this in a hurry so if am not clear pls let me no
Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in fruit salad.

Offline 247sports

  • SF Immigrant
  • **
  • Posts: 61
  • Reputation: 49
  • "A man becomes what he thinks"
Re: bio practical as
« Reply #2 on: May 17, 2010, 01:42:58 pm »
could someone plz explain me the process for serial dilution ???

Offline AS-Girl

  • SF Geek
  • ****
  • Posts: 431
  • Reputation: 465
  • Gender: Female
Re: bio practical as
« Reply #3 on: May 17, 2010, 01:49:22 pm »
Check this out
might help in getting the idea
http://www.youtube.com/watch?v=99ec1eDVkaE&feature=related