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How to only label the second, third and sixth line with 1, 2, 3?
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the arrow with catalyst in first line is a little bit longer than others. How can I extend others or let it shorter?
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How to label the second and third line with A, and fourth, fifth and sixth with B?
\begin{align*}
\ce{3H+ + 3BrO3^- + 5CH2(COOH)2 & ->[Ce3+] 3BrCH(COOH)2 + 4CO2 + 5H2O + 2HCOOH}\\
\mathrm{A:} \ce{Br- + BrO3^- + 2H+ & -> HBrO2 + HBrO}\\
\ce{Br- + HBrO2 + H+ & -> 2HBrO}\\
\mathrm{B:}\ce{Br- + BrO3^- + 2H+ & -> HBrO2 + HBrO}\\
\ce{BrO2. + Ce3+ H+ & -> HBrO2 + Ce4+}\\
\ce{2HBrO2 &-> BrO3- + H+ +HBrO}
\end{align*}
Best Answer
For the first objective, change from an
align*
to analign
environment and use\notag
directives on lines 1, 4, and 5.For the second, load the
mathtools
package and replace->[Ce3+]
with& ->[$\mathclap{\ce{Ce3+}}$]
.For the third, simply use two extra implicit columns and insert
\textnormal{(A)}
and\textnormal{(B)}
directives as needed.And do replace
\mathrm{A:}
with\textnormal{A}\colon
.