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Notes from Sodium and Potassium Demo Sodium…Group 1 alkali metal Atomic # 11 Atomic symbol Na 2 Isotopes P=11 N=12 Mass Number 23 11 protons 1 VALENCE 12 neutrons ELECTRON 11 electrons BURNS ORANGE Placed in water fizzed around on top. Seemed to give off a gas. Water Below changed color. The gas above the liquid was ignited proving that Hydrogen was present. Equation for Reaction of sodium and water: !" + !! ! → !"#$ + !! Gas Base Hydrogen ,Sodium Hydroxide A Base indicator (PHENOLPHATHALEIN) was added to the NaOH and it turned the liquid pink. In order to neutralize the base, an acid was added, HCl (hydrochloric acid). This turned the liquid back to clear indicating that a more neutral liquid was present. Equation for addition of HCl: !"#$ + !"# → !"#$ + !! ! Addition of HCl produced salt water. Potassium…Group 1 alkali metal Atomic # 19 Atomic symbol K P=11 N=12 Mass Number 39 19 protons 20 neutrons 1 VALENCE ELECTRON 19 electrons BURNS light purple or pink PURPOSE OF NUETRONS provide STRONG FORCE to hold nucleus together. Placed in water ignited with a pink flame. Water Below changed color. The gas above the liquid was attempted to be ignited but did not produce a flame. Hydrogen was burned immediately upon potassium hitting the water. Equation for Reaction of Potassium and water: ! + !! ! → !!" + !! Gas Hydrogen Burned Base ,Potassium off immediately Hydroxide A Base indicator (PHENOLPHATHALEIN) was added to the KOH and it turned the liquid pink. In order to neutralize the base, an acid was added, HCl (hydrochloric acid). This turned the liquid back to clear indicating that a more neutral liquid was present. Equation for addition of HCl: !!" + !"# → !!" + !! ! Addition of HCl produced salt water.