Chlorine gas was first prepared in 1774 by C. W. Scheele by...

Chlorine gas was first prepared in 1774 by C. W. Scheele by oxidizing sodium chloride with manganese(IV) oxide. The reaction is $\begin{aligned} \mathrm{NaCl}(a q)+\mathrm{H}_{2} \mathrm{SO}_{4}(a q)+\mathrm{MnO}_{2}(s) \longrightarrow & \mathrm{MnCl}_{2}(a q)+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Cl}_{2}(g) \end{aligned}$ Balance this equation.

Chlorine gas was first prepared in 1774 by C. W. Scheele by oxidizing sodium chloride with manganese(IV) oxide. The reaction is
$\begin{aligned} \mathrm{NaCl}(a q)+\mathrm{H}_{2} \mathrm{SO}_{4}(a q)+\mathrm{MnO}_{2}(s) \longrightarrow & \mathrm{MnCl}_{2}(a q)+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Cl}_{2}(g) \end{aligned}$
Balance this equation.

Key Concepts

Balancing Chemical Equations

This concept involves adjusting the coefficients before reactants and products in a chemical equation so that the number of atoms for each element is the same on both sides of the reaction. This is essential to abide by the law of conservation of mass, ensuring that matter is neither created nor destroyed when chemical reactions occur.

Stoichiometry

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. It allows chemists to predict how much of each reactant is needed and how much product will be made, based on the mole ratios derived from a balanced chemical equation.

Conservation of Mass

The principle of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. In balancing chemical equations, this principle helps ensure that the mass and the number of atoms remain constant before and after the reaction.

Redox Reactions

Redox (oxidation-reduction) reactions are processes in which electrons are transferred from one species to another. This concept is crucial in reactions where one element is oxidized (loses electrons) while another is reduced (gains electrons), and balancing such equations requires careful attention to both mass and charge.

Oxidation States

Oxidation states are used to keep track of electron transfer in chemical reactions. Assigning oxidation numbers allows chemists to identify which species are oxidized and which are reduced, thereby providing a systematic method for balancing redox reactions.

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