In order to understand behavior of CO₂ in underground associated with CO₂ sequestration in aquifer, we need to investigate the kinetics involved in solubility and mineral trapping. Here we conduct basic dissolution experiments using 3 powdered sedimentary rock samples collected from the Boso Peninsula, Chiba Prefecture in order to calculate dissolution rate constants, k for the 3 main constituent minerals: plagioclase, calcite, and dolomite. The k values for plagioclase calculated using temporal changes in H₄SiO₄ concentrations were within the range of values presented by Sverdrup (1990) or up to roughly 1 order of magnitude larger. We attribute this discrepancy to the difference between geometric and reactional surface area, dissolution of clay minerals in our samples, and increase in dissolution sites due to having powdered the samples. The k values for calcite and dolomite calculated using temporal changes in Ca²⁺ and Mg²⁺concentrations, respectively, turned out to be roughly 1 order of magnitude smaller than the values presented by Bidoglio and Stumm (1994) because of our inability to exclude contributions by ion exchange reactions to overall Ca²⁺ and Mg²⁺ concentrations. When temporal changes in HCO₃^- concentrations were used instead, the k values roughly matched those of Bidoglio and Stumm (1994) for both calcite and dolomite.