Materials: Reagent Central chemicals include both indicator reagents and reactan

Question

Materials: Reagent Central chemicals include both indicator reagents and reactants (center stage) Sodium hydrogen sulfite (NaHSO,) Indicators Chemical Reactants Hydrochloric acid (HC) Potassium iodide (K) Kl + starch Bromthymol Blue indicator (BTB) KI + starch + sodium hypochlorite Sodium nitrite (NaNO,) Sodium hydrogen carbonate NaHCO) Sodium hypochlorite (Na0CI) bleach (NaOCI) Acidic potassium permanganate KMdno.- hcm Py drogen perovide (i,0,) + HCI) Sodium hydroxide (NaOH) Ammonium chloride (NH,CI) Equipment Clear plastic cups Labtop reaction surface

Explanation / Answer

a) NaHSO3 with HCl

NaHSO3 + HCl --------> NaCl (aq) + H2O(l) + SO2(g)

b) NaNO2 with HCl

3 NaNO2 + 2HCl ---->2 NaCl(aq)+ NaNO3(aq) + H2O(l)+2NO(g)

When this NO further react with O2 from air

2 NO + O2 -------> 2 NO

c) NaHCO3 with HCl

NaHCO3 + HCl --------> NaCl (aq)+ H2O(l) + CO2(g)

d)

5 H2O2 + 2 MnO4^-1 + 6H^+1 --------> 5 O2 + 2Mn^+2 + 8 H2O

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