# Dilution confusion!!! - how to express in ratios??!!! (Jun/10/2010 )

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!!!!

Prep! on Jun 9 2010, 11:25 PM said:

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!)

moljul on Jun 10 2010, 12:21 PM said:

Prep! on Jun 9 2010, 11:25 PM said:

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!!!??!!

Prep! on Jun 9 2010, 11:53 PM said:

moljul on Jun 10 2010, 12:21 PM said:

Prep! on Jun 9 2010, 11:25 PM said:

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!

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!!

I have always thought of it as x parts of solute in x parts of total solution. Thus, 1 ml solution A (the solute) to 1ml solution B (the solvent) is a 1:2 dilution. Similarly, 1 ml solution A to 3 ml solution B is a 1:4 dilution, and results in 4 ml of a solution comprising one part of solution A for every three parts of solution B.

Think of it as "parts per total volume".

Well great! Now I'm confused!!

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.

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 tat is wat brought me to this confusion at the first place hb.. mathematically a ratio is always between A and B and not between A and the total.. please correct me if i understand this wrong!!!

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!!!

Chakchel on Jun 10 2010, 02:24 PM said:

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