A large bottle of orange juice is 2 liters, and a small bottle of orange juice is 1 / 10 liter. How many small bottles can a large bottle of orange juice be filled?

A large bottle of orange juice is 2 liters, and a small bottle of orange juice is 1 / 10 liter. How many small bottles can a large bottle of orange juice be filled?

2 △ 1 / 10 = 20 bottles
A large bottle of orange juice can be packed into 20 small bottles

Vitamin C is a kind of water solution vitamin, its molecular formula is c6h8o6, the lack of this vitamin is easy to get bad blood, so vitamin C is also known as ascorbic acid. Vitamin C is easily oxidized by oxygen in the air. Fresh fruits, vegetables and dairy products are rich in vitamin C, such as fresh orange juice, the content of vitamin C is about 500mg / L
Please determine the content of vitamin C in a brand of orange juice by experiment. Please fill in the blank
[tips]
Determination principle: c6h8o6 + I2 → c6h6o6 + 2H + + 2I -
Laboratory supplies and reagents:
① Instruments and supplies: (optional)
② Reagent: indicator (self-defined name). The concentration is 0.00750 mol / L standard iodine solution
The content of vitamin C in soft packed orange juice
If the answer is very good, 30 points will be added. Thank you

Abstract: Vitamin C (VitC), also known as ascorbic acid, can reduce capillary permeability, reduce blood lipids, enhance the body's resistance, and has a certain detoxification function and antihistamine effect. For its content determination, the iodometric method

In order to compare the content of vitamin C in apple juice and orange juice, what are the control conditions

Apple juice apple juice: regulate the intestines and stomach, promote renal function, and prevent hypertension, You can drink ordinary apple juice or concentrated juice mixed with water to reduce irritation. You can beat apple juice at home, but you should drink it immediately after you make it into juice, Orange juice is rich in calcium, potassium and vitamin C. experiments have shown that people with sufficient vitamin C in their blood are much less likely to die of heart disease

In order to compare the content of vitamin C in apple juice and orange juice
In order to compare the content of vitamin C in apple juice and orange juice, a student took two small beakers, added blue starch iodine solution (vitamin C can make starch iodine solution fade), and then dropped apple juice and orange juice into two small beakers with two rubber tipped droppers______
The quality of apple juice and orange juice must be equal
The mass of starch iodine solution in two small beakers must be equal
(3) the volume of each drop of juice from the two rubber tipped droppers must be equal
　　A、① B、② C、①② D、②③

Choose D
Objective: To compare the content of vitamin C in apple juice and orange juice
In the experiment, apple juice and orange juice are used to titrate starch iodine solution. The content of vitamin C in apple juice and orange juice is not equal, so the apple juice and orange juice are not equal
And ② and ③ are interference factors, which must be controlled equally