现象：黑色粉未变成红色，澄清石灰水变浑浊。 Cu(OH) 2+2HCl==CuCl 2+2H 2O Cu(OH) 2+H 2SO 4==CuSO 4+2H 2O NaOH+HCl==NaCl+H 2O 2NaOH+H 2SO 4==Na 2SO 4+2H 2O NaOH+HNO 3==NaNO 3+H 2O Mg(OH) 2+2HNO 3==Mg(NO 3) 2+2H 2O ...