# Dilution confusion!!!

### #1

Posted 09 June 2010 - 10:25 PM

If I add 1 ml solution A to 1ml solution B I diluted it 2 times. So what do I say in ratios? 1:1 or 1:2 dilution????!!!!!!!

Similarly, if I added 1 ml solution A to 3 ml solution B I diluted it 4 times. What do I say 1:3 times or 1:4 dilution???!!!!

One of those days in science that people dread to have!!!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #2

Posted 09 June 2010 - 10:51 PM

Hi folks.. this can be a very irritating question but then it has been eating me up since morning so I have to take it out.

If I add 1 ml solution A to 1ml solution B I diluted it 2 times. So what do I say in ratios? 1:1 or 1:2 dilution????!!!!!!!

Similarly, if I added 1 ml solution A to 3 ml solution B I diluted it 4 times. What do I say 1:3 times or 1:4 dilution???!!!!

One of those days in science that people dread to have!!!!

you know: 1:10 = 1+9

therefore -> 1:4 = 1part +3parts (e.g. 2,5ml + 7,5ml)

and -> 1:2 = 1+1 (in that case some say 1:1, but it is not the adequate designation!)

**Edited by moljul, 09 June 2010 - 10:52 PM.**

### #3

Posted 09 June 2010 - 10:53 PM

Hi folks.. this can be a very irritating question but then it has been eating me up since morning so I have to take it out.

If I add 1 ml solution A to 1ml solution B I diluted it 2 times. So what do I say in ratios? 1:1 or 1:2 dilution????!!!!!!!

Similarly, if I added 1 ml solution A to 3 ml solution B I diluted it 4 times. What do I say 1:3 times or 1:4 dilution???!!!!

One of those days in science that people dread to have!!!!

you know: 1:10 = 1+9

therefore -> 1:4 = 1part +3parts (e.g. 2,5ml + 7,5ml)

and -> 1:2 = 1+1 (in that case some say 1:1, but it is not the adequate designation!)

tat precisely is my confusion.. how to represent such dilutions... can it be represented in ratios?? or just say 2 times of 4 times diluted!!!??!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #4

Posted 09 June 2010 - 11:37 PM

Hi folks.. this can be a very irritating question but then it has been eating me up since morning so I have to take it out.

If I add 1 ml solution A to 1ml solution B I diluted it 2 times. So what do I say in ratios? 1:1 or 1:2 dilution????!!!!!!!

Similarly, if I added 1 ml solution A to 3 ml solution B I diluted it 4 times. What do I say 1:3 times or 1:4 dilution???!!!!

One of those days in science that people dread to have!!!!

you know: 1:10 = 1+9

therefore -> 1:4 = 1part +3parts (e.g. 2,5ml + 7,5ml)

and -> 1:2 = 1+1 (in that case some say 1:1, but it is not the adequate designation!)

tat precisely is my confusion.. how to represent such dilutions... can it be represented in ratios?? or just say 2 times of 4 times diluted!!!??!!

i think i donīt really understand what youre problem is and particularly why it is that important!

### #5

Posted 09 June 2010 - 11:57 PM

good one.. i guess that explains my state of mind right now!!!!

was just trying to figure out how can i represent dilutions in ratios

essentially if 1:10 = 1 part + 9 parts, then 10 does not represent B!!!!

10 represents the total so its the ratio of A to total... i was wondering is it tat way or is ratio the ratio of A to B!!!

Hope i m clear now!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #6

Posted 10 June 2010 - 12:39 AM

Think of it as "parts per total volume".

### #7

Posted 10 June 2010 - 12:49 AM

I had always thought of it as x amount of A for every x amount of B. As ratio of A to B, rather than amount of A in B.

So 1ml of A added to 1ml of B was a 1:1 ratio.

Or I would say A was diluted by a factor of 2 in B.

### #8

Posted 10 June 2010 - 12:54 AM

Ratio means you have x parts of A and y parts of B.

x : y

Dilution refers to the total volume.

x : (x+y)

### #9

Posted 10 June 2010 - 12:55 AM

So this parts of A to the total cannot be termed ratio (the mathematical one). i get ur point thoguht.. i have also been using 1:2 and 1:4 till now but then suddenly today morning i had a greater vision may be!!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #10

Posted 10 June 2010 - 12:57 AM

Don't mix dilution and ratio...

Ratio means you have x parts of A and y parts of B.

x : y

Dilution refers to the total volume.

x : (x+y)

well iguess i can buy that cause tat is the theory i have been supporting till date... so a dilution can never be represented in ratios!!! hope moljul is clear about my problem and its importance too

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #11

Posted 10 June 2010 - 01:02 AM

Don't mix dilution and ratio...

Ratio means you have x parts of A and y parts of B.

x : y

Dilution refers to the total volume.

x : (x+y)

well iguess i can buy that cause tat is the theory i have been supporting till date... so a dilution can never be represented in ratios!!! hope moljul is clear about my problem and its importance too

You only have to mention it properly...

When you

**dilute**something 1:4 it is a

**ratio**of 1:3.

### #12

Posted 10 June 2010 - 01:03 AM

so true!!!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #13

Posted 10 June 2010 - 01:18 AM

and a 1:2 dilution is a 1:1 ratio!!!

### #14

Posted 10 June 2010 - 02:26 AM

oh yessss!

and a 1:2 dilution is a 1:1 ratio!!!

i feel so relieved!!!!

**Support bacteria - They are the only culture some people have!!!**

**Cheers!!!**

### #15

Posted 10 June 2010 - 03:13 AM

If you don't know it, then ask it! Better to ask and look foolish to some than not ask and stay stupid.