How much deionized water does a kilogram of 95% alcohol need to add to make 75% alcohol?

How much deionized water does a kilogram of 95% alcohol need to add to make 75% alcohol?

Suppose: add water x liter [1L water = 1kg water]
（1+x）X75%=1LX95%
X = 0.2666l = 0.2666kg

How much water does it take to mix 500 g 95% alcohol into 75% alcohol
It's like density

Let the mass of water be X
25 X
▬▬▬▬▬ =▬▬▬▬▬▬▬▬▬▬▬
500g 500g×75%
The solution is x = 18.75g
Answer: ▁▁▁▁▁▁▁▁▁▁▁▁▁

There are 500 ml of 95% alcohol. How many ml of water do you need to add to make 75% alcohol?

500*95%=(500+x)*75%
X = 133.3 ml

Can 95% alcohol be added to tap water to make it 75%?
Bought concentration too high is not suitable for sterilization, can oneself use tap water to adjust

No, go to the hospital and buy a bottle of distilled water or normal saline

How much water and how much alcohol is needed to prepare 30 jin 75% alcohol
How to calculate

30*75%=22.5
30-22.5=7.5
A: 22.5 Jin of alcohol and 7.5 Jin of water

How to prepare different concentrations of alcohol? For example, how to prepare 95% alcohol into 75% alcohol or 95% alcohol into 75% 300ml

If there is no 300 * 0.75 = 225ml, 225 / 0.95 = 236.84ml, 75% D, 300ml alcohol needs 236.84ml, 95% alcohol, add water to 300

Dilute 150 kg of 95% alcohol to 75% alcohol with water______ Kilogram

150 × 95% △ 75% - 150 = 142.5 △ 0.75-150 = 190-150 = 40 (kg); a: 40 kg of water is needed

Now we have 95% alcohol solution. Now we need to prepare 500ml of 75% alcohol solution. How many ml of 95% alcohol and water do you need? Thank you

If the concentration is volume concentration, it is very simple. Suppose that the volume of 95% alcohol is V, 75% * 500 = 95% v, v = 394.73ml, and the volume of water is 500-394.73 = 105.27

How many ml of water is needed to dilute 600 ml of 95% alcohol to 75% disinfectant alcohol?

Do you know the cross method?
Let me demonstrate
The alcohol concentration of water is 0%
Do it in this way.
0% water
Target concentration: 75%
95% alcohol
Think of a square as a space It's too much trouble
The above is cross subtraction. That is to say, the absolute value of 20:75 is the volume ratio
Water: alcohol = 20 / 75 = 4 / 15
The volume of water is 600 * 4 / 15 = 160ml~
The other way is to make equations~
Let the volume of water be X~
(95％×600＋X)\(600+X）＝75％
It's still 160ml
It is recommended to master the cross method. It is very convenient not only to calculate the concentration, but also to calculate the composition of organic matter and gas mixture
Specific calculation process can ask teachers, teachers should know this method~

Mr. Wang plans to dilute 95% alcohol into 75% alcohol in class 30. How many grams of water should be added?

30 × 95% △ 75% - 30 = 8g