Hello,
I'm trying to make my own dilute acid to do alkalinity titrations. Per the method I'm using, I'm trying to create a solution that has a pH of 3.6 to 3.9 when the acid is diluted at 100:1.
For my initial calculations, i used 12M (37%) lab grade HCl. at a ratio of 2.464 g HCl per L of RODI. I'm relatively confident that the scale I used is accurate, as well as the liquid volumes.
I made a batch of solution 18L in size, so I added 44.352 g of HCl to the batch. However, after time was allowed for mixing, the pH of the solution was 4.0. I'm very confident in the precision of the pH probe. I'd like to continue to adjust the pH down with HCl such that I sit in the middle of that pH range. So I would like to adjust the pH down by 0.25 using HCl.
Can a chemistry guru here help me determine how much to add so I dont ruin this batch of reagent?
I'm trying to make my own dilute acid to do alkalinity titrations. Per the method I'm using, I'm trying to create a solution that has a pH of 3.6 to 3.9 when the acid is diluted at 100:1.
For my initial calculations, i used 12M (37%) lab grade HCl. at a ratio of 2.464 g HCl per L of RODI. I'm relatively confident that the scale I used is accurate, as well as the liquid volumes.
I made a batch of solution 18L in size, so I added 44.352 g of HCl to the batch. However, after time was allowed for mixing, the pH of the solution was 4.0. I'm very confident in the precision of the pH probe. I'd like to continue to adjust the pH down with HCl such that I sit in the middle of that pH range. So I would like to adjust the pH down by 0.25 using HCl.
Can a chemistry guru here help me determine how much to add so I dont ruin this batch of reagent?