How much Cold Water is needed?

[Vig16]

I have a question about how to cool the water that's already in my cup. I already have 3-4 ounces of 70°C water in my cup and want to bring that overall temperature down to 35-38°C. The end solution needs to have 8 ounces of water. I already tried doing this with room temperature water (20-25°C) and the end solution came out to be 41°C and 46°C in my two trials.

Is there a certain formula I can use to calculate the temperature needed to cool the 70°C water down to my desired range?

 

[Maxong091]

Hi,

Is it as simple as a ratio , assuming there is no heat loss to the surroundings through the process and that the water is well mixed

if you have

4 ounces at 70
4 ounces at 20
you'll have 8 ounces at 45

by that logic you'd need water at about 3-4 degrees

 

[Vig16]

Hi,

Is it as simple as a ratio , assuming there is no heat loss to the surroundings through the process and that the water is well mixed

if you have

4 ounces at 70
4 ounces at 20
you'll have 8 ounces at 45

by that logic you'd need water at about 3-4 degrees

Great! Thank you! I knew it had to be a simple calculation, but didn't even think it'd be that simple!