500 g of 70% alcohol solution and 300 g of 50% alcohol solution are mixed, and the concentration of alcohol solution is 0______ ．

500 g of 70% alcohol solution and 300 g of 50% alcohol solution are mixed, and the concentration of alcohol solution is 0______ ．

500 × 70% = 350 (g); 300 × 50% = 150 (g); (350 + 150) / (500 + 300), = 500 ／ 800, = 62.5%; answer: the concentration of alcohol solution after mixing is 62.5%. So the answer is: 62.5%

How much 70% alcohol can be put into 500 grams of 90% alcohol to make 75% alcohol?

Let 70% alcohol be added as a gram. According to the known conditions, the equation: (500x0.90 + ax0.70) / (500 + a) = 0.75 is solved to get a = 1500. Therefore, 1500 grams of 70% alcohol should be added

What is the concentration of the alcohol solution after mixing 500 g of 70% alcohol solution and 300 g of 50% alcohol solution?

(500*70%+300*50%)/（500＋300）＝62.5％

How many grams of water is needed to dilute 500 grams of 90 percent alcohol solution to 75 percent alcohol solution

500g*90%=(500g+x)*75%
x=100g
Add 100 grams of water

I would like to ask the concentration of 95% alcohol 500ml with a concentration of 75%, how much water should be added?

It's a very simple arithmetic problem. If the volume change of the mixture is not calculated, let the total volume after dilution be x, 75% * x = 500 * 95%, x = 633.33, then the water to be added is 633.33-500 = 133.33 (ML)

How much water should be added to make 75% alcohol?

(500 × 95%) / 75% - 500 = 133.33 ml water

How much water should be added when 95% alcohol 500ml is mixed with 75% alcohol
The standard answer is 178ml, why?

I think there seems to be a problem
Alcohol solution is alcohol soluble in water, so the total density is less than 1 g / cm3
Let 75% alcohol solution be x ml, the percentage of 95% alcohol with low density (P small g / cm3) and 75% alcohol with high density (P large g / cm3) be mass fraction
So 95% * P small * 500 = P large * x * 75% x = 500 * 95 * P small / 75 * P large
The mass of 75% alcohol is 500 * 95 * P small / 75 g, while the mass of 95% alcohol is 500 * P small / 75 G
According to the conservation of mass, the mass of added water is 75% alcohol - 95% alcohol = 20 * 500 * P small / 75 G
The density of water is 1g / cm3, so the volume of added water is 20 * 500 * P small / 75 ml
It is about 133.33 * P small ml because P is small

The concentration of 95% alcohol needs to be mixed into 75% alcohol. How much 95% alcohol and water does 4 jin need

The density of 75% alcohol solution is 0.87g/cm3, The density of 95% alcohol solution is 0.8g/cm3, the mass fraction of 75% alcohol solution is (75% * 0.87g / cm3) / (75% * 0.87g / cm3 + 25% * 1g / cm3) * 100% = 72.3%, and the mass fraction of 95% alcohol solution is (95% * 0.8g / cm3) / (95% * 0.8g / cm3 + 5% * 1g / cm3) * 100% = 93.8%. The volume fraction of 95% (mass fraction) is required to prepare 4 kg alcohol with 75% (mass fraction of 72.3%) The mass of alcohol is x, X * 93.8% = 4 * 72.3%. The solution is x = 3.1 kg. The mass of water is 4 kg-3.1 kg = 0.9 kg. A: 3.1 kg 95% alcohol and 0.9 kg water are needed

How to make 95% alcohol into 75% alcohol

It's very simple, but you'd better use a standard volumetric flask or something, because the total volume of alcohol and water will become smaller in the process of adding water. You first calculate that 95% of a volume contains 0.95 volume of alcohol (alcohol is expressed as a percentage by volume), and then convert it into 75%, that is to say, there must be (0.95 divided by 0.75) volume of finished product mixture, The calculated volume is 1.27. Then you can add water to the container and shake it gently until the total volume reaches 1.27. It's not changed, so it's solved! I'm so tired. I don't even have any points, but I'll help you!

95% alcohol with 75% alcohol
I have a 250ml bottle of 95 alcohol, which is made into 75. How much water should I add,
What kind of water to add!
Do you have 75% alcohol sold directly?

(250 * 0.95) / 0.75-250 = 66.66ml, it is recommended to use distilled water. If there is no distilled water, add purified water instead. In fact, 75% alcohol is easier to buy than 95% alcohol