Math & Science ⇒ Break up Equation and keep its Label right

[NinaKeul]

Dear all,

I am an newbie to LaTeX and hope that somebody can help me.

I have read through many forum postings, but could not find an answer, that would solve my problem.

I am trying to include a couple of equations into my thesis and have problems with placing the equation label exactly on the right for equations that are longer than one line (for single line equations it works just fine).


Below is a minimal examples of my code.

Thank you very much in advance,
Nina

Code: Select all

\documentclass[a4paper, twoside, titlepage, openright, 12pt, listof=totoc]{scrreprt}
\usepackage{amsmath, amssymb}		

\begin{document}

\begin{equation}
DIC =[CO_2^*]+[HCO_3^-]+ [ CO_3^{ 2-}]
\label{equ:4}
\end{equation}

\begin{equation}
  TA =[HCO_3^-]+2 [ CO_3^{ 2-}]+[B(OH)_4^-]+[OH^-]+[HPO_4^{2-}]+2[PO_4^{3-}]\\
  +[Si(OH)_3^-]+[NH_3]+ [HS^-]+...-[H^+]_F-[HF]-[H_3PO_4]-...                             \label{equ:6}
\end{equation}
\end{document}

[cgnieder]

Hi Nina,

Welcome to the LaTeX community!

The split environment provided by amsmath is what you need. Details on it and on many other math related stuff can be found in the excellent mathmode document.

I couldn't help noticing that you're trying to typeset chemical formulas. For that task I would recommend either using the mhchem or the chemmacros package. Here is an example:

Code: Select all

\documentclass{scrreprt}
\usepackage{amsmath}
\usepackage{chemmacros}

\begin{document}

\begin{equation}
 DIC = \ch{[CO2^*] + [HCO3^-] + [CO3^{2-}]} \label{equ:4}
\end{equation}

\begin{equation}
\begin{split}
 TA &= \ch{[HCO3^-] + 2 [CO3^{2-}] + [B(OH)4^-] + [OH^-] + [HPO4^{2-}] + 2 [PO4^{3-}]} \\
   &\quad \ch{+ [Si(OH)3^-] + [NH3] + [HS^-] +} \ldots - \ch{[H^+]_F} - \ch{[HF]} - \ch{[H3PO4]} - \ldots
\end{split}
\end{equation}

\end{document}

Regards

[NinaKeul]

Hi Clemens,

thank you very much for the fast solution and pointing me to teh packages for chemical formulas.

Works perfectly!

Best wishes,
Nina