A factory uses 98% concentrated sulfuric acid (density is 1.84 g / cm3) to prepare 30% dilute sulfuric acid for production. The volume ratio of concentrated sulfuric acid to water is the closest to () A. 1：3B. 1：4C. 1：5D. 1：6

A factory uses 98% concentrated sulfuric acid (density is 1.84 g / cm3) to prepare 30% dilute sulfuric acid for production. The volume ratio of concentrated sulfuric acid to water is the closest to () A. 1：3B. 1：4C. 1：5D. 1：6

Suppose that the mass of concentrated sulfuric acid used in preparation is x, and the mass of water is YX × 98% = (x + y) × 30%. The solution gives X: y = 30:6898%, the density of concentrated sulfuric acid is 1.84g/cm3, and the density of water is 1g / cm3; then the volume ratio of concentrated sulfuric acid and water used in preparation is 301.84:681 ≈ 1:4

The concentration of 250mlh2so4 was 98%, and the density of concentrated sulfuric acid was 1.84g/cm3, diluted to 600ml. The density of the solution was 1.35g/cm3,
What is the concentration of H2SO4 in the solution?

The mass fraction of 250mlh2so4 is 98% and the density is 1.84g/cm3
n（H2SO4）=250mL*1.84g/cm3* 98% /98g/mol=4.6mol
The concentration of H2SO4 in the solution is 4.6mol/0.6l = 7.67mol/l

The laboratory needs to use 98% concentrated sulfuric acid (density is 1.84g/cm3) to prepare 100g dilute sulfuric acid with 10 mass fraction of solute

The preparation process of solution generally has three steps: calculation; weighing; dissolution; so there are the following processes
The first calculation: according to the principle that the mass of solute in the solution before and after dilution remains unchanged, the volume of concentrated sulfuric acid can be solved by the following equation: X * 1.84g/ml * 98% = = 100g * 10%
X==5.6ml　　
The mass of concentrated sulfuric acid is 5.6ml * 1.84g/ml = = 10.3G; the mass of water is 100g-10.3g = = 89.7g; the density of water is 1g / ml
So the volume of water needed is 89.7ml
Therefore, according to the requirements of slowly pouring concentrated sulfuric acid into water and continuously stirring with glass rod when diluting concentrated sulfuric acid, the process is as follows:
Step 2: use a measuring cylinder with a measuring range of 100ml to measure 89.7ml of water and pour it into the beaker,
Third, use a 10 ml measuring cylinder to measure 5.6 ml of concentrated sulfuric acid, slowly pour it into water, and constantly stir it with a glass rod to get a dilute solution