- Now, let's see. Where is the potassium disulfate?
- Oh, thanks. This should...

7 seconds sound clip from Scooby-Doo, Where Are You! - Scooby Doo and a Mummy, Too (S1E12).

You can hear this line at 00:11:35.762 in the Blu-ray version of the episode.

Quote context

[...]

- Well, at least he left his calling card.

- It looks more like a piece of that tape he's all wrapped up in to me.

- It is, Shaggy, but it sure doesn't feel 3000 years old to me. Come on. Let's go to the school lab and test it.

- This test will tell us just how old that tape really is.

- Well, come on. Like, hurry. This place makes me so nervous all I can think of is food.

- Me, too!

- Ohh! Ribbit! Ribbit!

- Now, let's see. Where is the potassium disulfate?

- Oh, thanks. This should...

- Uh-oh! I wish I hadn't seen what I think I saw!

- Coin! Coin!

- Zoinks! It's the creepy coin collector again!

- Pardon me. It's time for a smoke-screen exit.

- Like, let's get out of here.

- Velma! Shaggy!

- What's going on?

[...]