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A 25.00-mL sample of an unknown HClO4 solution requires titration with 22.62 mL of 0.2000 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO4 solution? The neutralization reaction is:

A 30.00-mL sample of an unknown H3PO4 solution is titrated with a 0.100 M NaOH solution. The equivalence point is reached when 26.38 mL of NaOH solution is added. What is the concentration of the unknown H3PO4 solution? The neutralization reaction is:

Complete and balance each gas-evolution equation. a. HBr(aq) + NiS(s) b. NH4I(aq) + NaOH(aq) c. HBr(aq) + Na2S(aq)

Complete and balance each gas-evolution equation. a. HCl(aq) + KHCO3(aq) b. HC2H3O2(aq) + NaHSO3(aq) c. (NH4)2SO4(aq) + Ca(OH)2(aq)

Write a balanced equation for the reaction between perchloric acid and lithium carbonate.

Write a balanced equation for the reaction between nitric acid and sodium sulfite.

Assign oxidation states to each atom in each element, ion, or compound. a. Ag b. Ag+ c. CaF2 d. H2S e. CO3 2- f. CrO4 2-

Assign oxidation states to each atom in each element, ion, or compound. a. Cl2 b. Fe3+ c. CuCl2 d. CH4 e. Cr2O7 2- f. HSO4-

What is the oxidation state of Cl in each ion? a. ClO- b. ClO2- c. ClO3- d. ClO4-

Determine whether or not each reaction is a redox reaction. For each redox reaction, identify the oxidizing agent and the reducing agent. a. 4 Li(s) + O2(g)-2 Li2O(s) b. Mg(s) + Fe2+(aq)-Mg2+(aq) + Fe(s) c. Pb(NO3)2(aq) + Na2SO4(aq)-PbSO4(s) + 2 NaNO3(aq) d. HBr(aq) + KOH(aq)-H2O(l) + KBr(aq)