This is an acid-base reaction (neutralization): H2SO4 is an acid, Cu(OH)2 is a base.
Reactants:
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H2SO4 – Sulfuric acid
Other names: Oil of vitriol, Sulfuric acid, concentrated (> 51% and , H2SO4
Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]
Cu(OH)2 – Copper(II) hydroxide
Other names: Cupric hydroxide, Cu(OH)2
Appearance: Blue or blue-green solid
Products:
CuSO4 – Copper(II) sulfate
Other names: Cupric sulphate, Blue vitriol (pentahydrate), Bluestone (pentahydrate)
Appearance: Gray-white (anhydrous) | blue (pentahydrate) ; White hygroscopic crystals
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxide
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
2 → CuSO4 + 2 H2O – Balanced equation){kind=link}