Preparation method for aqueous solution of sulfuric acid
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Calculation method

The following relations exist among mass and volume of solution, etc.

    M_a = V_aD_cW_c/100,   M_b = V_b+V_aD_c(100-W_c)/100,   W = 100M_a/M,

    M = M_a+M_b = V_aD_c+V_b = VD,   C = 1000M_a/FV,   Q = V/V_b,   1L = 1000mL

where V_a(mL), W_c(%) and D_c(g/mL) are volume, mass percentage and density of conc. H₂SO₄ aqueous solution before dilution, M_a(g) mass of dissolved H₂SO₄, V_b(mL) volume of diluent water before dilution, M_b(g) mass of total water, M(g), V(mL), W(%), C(mol/L), and D(g/mL) mass, volume, mass percentage, molarity, and density of solution after dilution, Q volume of solution after dilution/volume of diluent water before dilution, F(g/mol) formula weight of H₂SO₄.

An unknown value can be calculated with the use of relations shown above and known values.

You may use the upper table to convert concentration to density, volume of solution/volume of diluent water to concentration.

Preparetion method

Wash and dry apparatus beforehand.
1  Measure disstilled water with a measuring cylinder, and transfer the water to a beaker.
2  Measure conc. H₂SO₄ aqueous solution with another measuring cylinder, and add slowly into the beaker with stirring.
3  If you need, transfer the solution to a reagent bottle and attach label showing the reagent's name, concentration, date, the person who prepared.

Caution

If conc. sulfuric acid gets in contact with the eyes or is stained with the skin, immediately wash it with water.

Keep particularly in mind that it generates heat very much and steam comes out when adding conc. sulfuric acid slowly to a large quantity of water with stirring.  Moreover, since there is toxicity in the steam (sulfuric acid aqueous solution), deal with it in a well ventilated place so that steam may not be inhaled.  In adjusting the total volume of solution, do it after getting cold.

The presumed concentration of reagent grade chemicals is about 90%, 98%, or 100%.  When the exact concentration of dilute sulfuric acid solution is required, titrate it against a solution of a base of known concentration, a standard solution; then, you can determine its exact concentration.