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Reaction rates


The reaction between Mg(s) and HCl(aq) is represented by the equation above. In a kinetics experiment, a 0.080 g sample of Mg(s) ribbon is added to an Erlenmeyer flask containing 50 mL of 3.0MHCl(aq) at 25°C. The rate of the reaction is determined by measuring the volume of HA2(g) produced every five seconds.
Which of the following experimental changes is most likely to decrease the rate of HA2(g) production?
Choose 1 answer: