Know about ppm ,ppb ,ppt ,and iom asked question in bachlor in pharmacy 1st year

1. CHEMISTRY 1
(INORGANIC)
Calculation involving PPM ,PPB
and PPT

3. After attending this presentation ,the
student should able to gain knowledge
and learn following skills

4. Regardless we have various
method of expressing concentration
like

5. Just look one example
• If a well water contains 10mg of Arsenic in
1000000 ml of water then what is its
concentration in gram per liter????( solve
quickly)
• (ans 0.00001g/l)

6. Basic concepts you must know
Nitrogen= 14
Oxygen= 16
Sulfur = 32
Chlorine = 35.5
Potassium = 39

7. • Qu1. 331 g of lead nitrate contains
207 g of lead then how much lead will
be present in 0.0015 g of lead nitrate?
(use cal. Or mob . If necessary)
Qu2.Amount of potassium sulphate
in 5ml of 0.0181 % k2so4 solution??

8. Q1. Amount of lead in 0.0015 g 0f lead nitrate ?
Q 2. Amount of sulphate ion in 0.000905 g of
potassium sulphate ?
Q3 . Amount of As in 0.001 g of As2o3 ?
Q4 . Amount of Pb in 0.0001343 g of Pbcl2?
Q5 . 0.0005 g of Fe is present in how many g of
feso4.7h2o ?
Q6 . 0.00005 g Fe is present in …… g of Feso4 .

9. Basic concepts in ppm
• One million = 1000000=10^6
• One billion = 1000000000=10^9
• One trillion = 1000000000000=10^12

10. • 1(2060). In a sample of 100ml water from a
well 0.0015 g of Pb(no3)2 was found .
What is the concentration of Pb in terms of
ppm? (Atomic weight of Pb(no3)2 is 207)
• 2(2068/8) . In the limit test for sulphate ,
5ml of 0.0181% k2so4 is taken which is
diluted to 100ml, what will be concentration
of SO4 ions in ppm ?

11. • 3(2069) A sample of water contains 0.001 g
As2O3 per liter . What will be the
concentration of As in terms of ppm and
ppb ? (Atomic wt of arsenic is 75)
• 4(2069/9) In the limit test for lead , 10 ml
solution (containing 0.01343g Pbcl2 per
liter ) was taken . Acetate buffer 2ml and
Thioacetamide reagent 1.2ml were added
and the solution was made upto 50ml . What
is the concentration of Pb in ppm in the
solution ?(mol wt. of Pbcl2 is 278)

12. • 5.(2071/3). You are required to prepare a
5ppm solution of iron using
FeSO4.7H2O(mol wt 278) , what weight will
you dissolve to make 100ml of solution ?
• 6.(2071/7) In the limit test for iron , you are
provided with 0.005% solution of FeSO4(mol
wt 150) . What volume of this solution will
you take to prepare a 10 ml standard iron
solution containing 5ppm iron???

15. • 1p. How much KCl will you dissolve in
5oo ml water to prepare 500ml 0f 40ppm
chloride solution ?
• 2p. How will you prepare 500 ml of 50
ppm of SO4– by using FeSO4.7H2O .
(mol wt of FeSO4.7H2O is 278 )

16. • Unitary method- Qu1:0.0009381 g,
Qu2:0.000905 g
• Chemical calculation- Q1: 0.0009831 g , Q2:
4.99* 10^-4 g , Q3: 7.575 * 1o^-4 g , Q4: 1 * 1o^-
4 g , Q5: 0.00248 g & Q6: 1.389* 1o^-4 g
• Past question- 1: 9.4ppm, 2: 5 ppm , 3:
0.7575ppm &757.5ppb ,4 : 2ppm , 5: 0.00248 g ,
6: 2.78 ml
• +2 background- Q : 0.01269 g
• MBBS Q: b
• Commom practical qsn- 1p: 0.042 g , 2p: 0.724 g

17. Have you ever wondered why the
solution become 1ppm only when you
dissolve 1g of solute in 10^6 ml of
water?
Does solution become 1ppm if you dissolve 1 g of cl^- in 10^6ml of ethanol ??

19. Some hints……!
Hints finished now use your
brain for 2 minutes!!!!!!!

21. Normality = (weight * 1000)/(equivalent wt * volume)
Molarity= ( weight * 100)/ ( molecular wt * volume)
Gram/liter = normality * equivalent mass of solute= molarity*
molecular mass
Normality= n * molarity …. n=bsicity or acidity
Percentage by volume = 1/10 of g/liter
Normality ={ (w/W)%*density or sp.gravity * 10}/equivalent
weight
Normality equation : n1v1=n2v2

22. q. How will you prepare 0.1N NaOH of volume
500ml by using solute NaOH?
2. Find the normality of con HCl or H2SO4 that is
kept in your lab ? (you will be provided with %of
purity and sp . Gravity in label of bottle ?
3. Prepare 250ml 0.1N AgNO3?
4. If u have 8M H2SO4 . How will prepare 250ml of
0.5N H2SO4
5. How would you make 10% of 50 ml ethanol by
using 90% ethanol?

24. IF you really understand and like my presentation do not forgot to mail me at
rahikshitiz@gmail.com valuable suggestion and criticism are highly welcomed !