No, MgSO4 7H2O (magnesium sulfate heptahydrate) is not acidic in solution. It is a salt formed by the reaction of magnesium hydroxide (a base) and sulfuric acid (an acid). When dissolved in water, it dissociates into magnesium ions (Mg2+) and sulfate ions (SO42-). These ions do not react with water molecules to produce hydronium ions (H3O+), which are responsible for the acidic nature of a solution. Therefore, magnesium sulfate heptahydrate is considered a neutral salt and does not exhibit acidic properties in water.