I posted this response under your answer but I thought I would repeat it here just in case you didn't look back at the other one. I really appreciate you helping. When you go to science geek, you have to type in Shockwave/Titration to get the experiment. Now, according to what you said, if I take the moles of base and volume of base which I would know and divide by acid, I would find the [H+] of the acid, correct? When I used the different indicators, I always come up with the same [H+} of each acid no matter what the indicator was used, just different amounts of base was needed-so I could actually choose which indicator I wanted, correct?
I usually check on the initial site until it gets past page 2 or 3, then I quit and one must post again to get my attention.
thank you
Yes, you are correct in your understanding. Let me explain it in more detail.
To determine the concentration of acid, you can indeed use the mole ratio between the acid and the base (titrations are typically performed with a known concentration of the base solution). By knowing the moles of base and the volume of base used in the titration, you can calculate the moles of acid that reacted with the base.
To calculate the concentration of [H+] (hydrogen ion concentration), you need an additional step. The acid dissociates in water to yield hydrogen ions (H+) and anions. The number of moles of hydrogen ions produced is equal to the number of moles of acid in the reaction.
To find the concentration of [H+], you need to divide the moles of acid that reacted by the volume of the solution (in liters) that you titrated. This gives you the molarity (M) of the acid, which is equal to the concentration of [H+].
So, the formula is: [H+] = moles of acid / volume of solution
As for the choice of indicator, you are correct that different indicators will require different amounts of base to reach the equivalence point (where the moles of base added equal the moles of acid present). However, the calculated [H+] of the acid should remain the same, regardless of the indicator used.
Indicators are substances that change color at different pH levels, and their purpose is to help determine when the equivalence point has been reached. Different indicators have different pH ranges over which they change color. So, you can choose an indicator that has a color change within the expected pH range of your acid.
In summary, you can choose an indicator based on the pH range of your acid, but the calculated [H+] of the acid should remain consistent regardless of the indicator used.