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The partial pressure of methanesulphonic acid (MSA) was measured above concentrated aqueous MSA solutions at 25°C and used to estimate an equilibrium constant of 6.5×1013 mol2 kg‐2 atm‐1 for the reaction: CH3SO3H(g) = H+(aq)+CH3SO3 ‐(aq). MSA will be effectively scavenged by water in the atmosphere. As a strong acid MSA will displace HCl gas from the marine aerosol and may be responsible for a part of HCl(g) in the remote atmosphere.
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Clegg et al. (1985) studied this question.
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