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Classify the following as acid-base reaction or oxidation-reduction reactions.

(a)\(N{a_2}S\left( {aq} \right) + 2HCl\left( {aq} \right) \to 2NaCl\left( {aq} \right) + {H_2}S\left( g \right)\)

(b)\(2Na\left( s \right) + 2HCl\left( {aq} \right) \to 2NaCl\left( {aq} \right) + {H_2}\left( g \right)\)

(c)\(Mg\left( s \right) + C{l_2}\left( g \right) \to MgC{l_2}\left( s \right)\)

(d)\(MgO\left( s \right) + 2HCl\left( {aq} \right) \to MgC{l_2}\left( {aq} \right) + {H_2}O\left( l \right)\)

(e)\({K_3}P\left( s \right) + 2{O_2}\left( g \right) \to {K_3}P{O_4}\left( s \right)\)

(f)\(3KOH\left( {aq} \right) + {H_3}P{O_4}\left( {aq} \right) \to {K_3}P{O_4}\left( {aq} \right) + 3{H_2}O\left( l \right)\)

Short Answer

Expert verified

The classification of reactions isas follows:

(a) Acid-base reaction

(b) Oxidation-reduction reaction

(c) Oxidation-reduction reaction

(d) Acid-base reaction

(e) Oxidation-reduction reaction

(f) Acid-base reaction.

Step by step solution

01

Classification of the reaction in part (a)

\(N{a_2}S\left( {aq} \right) + 2HCl\left( {aq} \right) \to 2NaCl\left( {aq} \right) + {H_2}S\left( g \right)\)

In this reaction there is no change in the oxidation state of the ions involved. Further, there is transfer of protons leading to formation of the sodium chloridesalt.Therefore, it is an acid-base reaction.

02

Classification of the reaction in part (b)

\(2Na\left( s \right) + 2HCl\left( {aq} \right) \to 2NaCl\left( {aq} \right) + {H_2}\left( g \right)\)

Here elemental sodium is oxidised from 0 to +1 state and hydrogen is reduced from +1 to 0 state.Therefore, it is an oxidation-reduction reaction.

03

Classification of the reaction in part(c)

\(Mg\left( s \right) + C{l_2}\left( g \right) \to MgC{l_2}\left( s \right)\)

Here magnesium is oxidised from 0 to +2 state and chlorine is reduced from 0 to -1 state.Therefore, it is an oxidation-reduction reaction.

04

Classification of the reaction in part(d)

\(MgO\left( s \right) + 2HCl\left( {aq} \right) \to MgC{l_2}\left( {aq} \right) + {H_2}O\left( l \right)\)

Here the transfer of proton leadsto the formation of the magnesium chloride salt.No oxidation state change of the ions involved is observed.Therefore, it is an acid-base reaction.

05

Classification of the reaction in part(e)

\({K_3}P\left( s \right) + 2{O_2}\left( g \right) \to {K_3}P{O_4}\left( s \right)\)

Here phosphorus is oxidised from -3 to +5 state and oxygen is reduced from 0 to -2 state.Therefore, it is an oxidation-reduction reaction.

06

Classification of the reaction in part (f)

\(3KOH\left( {aq} \right) + {H_3}P{O_4}\left( {aq} \right) \to {K_3}P{O_4}\left( {aq} \right) + 3{H_2}O\left( l \right)\)

In this reaction the transfer of the protons and the hydroxyl ion leadsto the formation of the potassium phosphate salt.Therefore, it is an acid-base reaction.

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Most popular questions from this chapter

This equation describes the production of tin (II) chloride.\(Sn\left( s \right) + 2HCl\left( g \right) \to SnC{l_2}\left( s \right) + {H_2}\left( g \right)\)Is this a redox reaction? If so, provide a more specific name to the reaction if appropriate, and identify the oxidant and reductant.

What volume of a 0.00945 M solution of potassium hydroxide would be required to titrate 50.00 mL of a sample of acid rain with a H2SO4 concentration of 1.23ร—10-4M

\({{\rm{H}}_2}{\rm{S}}{{\rm{O}}_{4({\rm{aq}})}}{\rm{ + 2KO}}{{\rm{H}}_{({\rm{aq}})}}{\rm{ }} \to {\rm{ }}{{\rm{K}}_2}{\rm{S}}{{\rm{O}}_{4({\rm{aq}})}}{\rm{ + 2}}{{\rm{H}}_2}{{\rm{O}}_{{\rm{(l)}}}}\)

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\(2MnO_4^ - \left( {aq} \right) + 5{H_2}{C_2}{O_4}\left( {aq} \right) + 6{H^ + } \to 10C{O_2}\left( g \right) + 2M{n^{2 + }}\left( {aq} \right) + 8{H_2}O\left( l \right)\)

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In a common medical laboratory determination of the concentration of free chloride ion in blood serum, a serum sample is titrated with a Hg(NO3)2 solution.

2Clโˆ’(aq) + Hg(NO3)2(aq)โŸถ2NO3โˆ’(aq) + HgCl2(s)

What is the Clโˆ’ concentration in a 0.25-mL sample of normal serum that requires 1.46 mL of 8.25ร—10โˆ’4MHg(NO3)2(aq) to reach the end point?

Balance the following equations:

\(\begin{array}{l}\;(a)\;PC{l_5}\left( s \right) + {H_2}O\left( l \right) \to POC{l_3}\left( l \right) + HCl\left( {aq} \right)\\\left( b \right)\,Cu\left( s \right) + HN{O_3}\left( {aq} \right) \to Cu{\left( {N{O_3}} \right)_2}\left( {aq} \right) + {H_2}O\left( l \right) + NO\left( g \right)\\\left( c \right){H_2}\left( g \right) + {I_2}\left( g \right) \to HI\left( s \right)\\\left( d \right)\,Fe\left( s \right) + {O_2}\left( g \right) \to F{e_2}{O_3}\left( s \right)\\\left( e \right)\,Na\left( s \right) + {H_2}O\left( l \right) \to NaOH\left( {aq} \right) + {H_2}\left( g \right)\\\left( f \right)\,{\left( {N{H_4}} \right)_2}C{r_2}{O_7}\left( s \right) \to C{r_2}{O_3}\left( s \right) + {N_2}\left( g \right) + {H_2}O\left( g \right)\\\left( g \right){P_4}\left( s \right) + C{l_2}\left( g \right) \to PC{l_3}\left( l \right)\\\left( h \right)PtC{l_4}\left( s \right) \to Pt\left( s \right) + C{l_2}\left( g \right)\end{array}\)

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