This is a precipitation reaction: Cu(OH)2 is the formed precipitate.
Reactants:
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Cu(NO3)2 – Copper(II) nitrate
Other names: Cupric nitrate, Nitrato de cobre (II), Нитрат меди (II) (безводный)
Appearance: Blue crystals | hygroscopic
NaOH
Names: Sodium hydroxide, Caustic soda, Lye
Appearance: White, waxy, opaque crystals ; White hygroscopic solid in various forms ; Colorless to white, odorless solid (flakes, beads, granular form).
Products:
Cu(OH)2 – Copper(II) hydroxide
Other names: Cupric hydroxide, Cu(OH)2
Appearance: Blue or blue-green solid
NaNO3 – Sodium nitrate
Other names: Peru saltpeter, Soda niter, Cubic niter
Appearance: White powder or colorless crystals ; Colourless hygroscopic crystals
2 + 2 NaOH → Cu(OH)2 + 2 NaNO3 – Balanced equation){kind=link}