A sample of grape juice has a hydroxide ion concentration of 1.4 × 10-10 M. Is the grape juice more or less acidic than a sample of orange juice that has a hydronium ion concentration of 1.8 × 10-4 M? To compare the acidity of the orange juice and grape juice, compare the hydronium ion concentrations and/or pH values of the two solutions. How does the acidity of a solution vary with hydronium ion concentration and pH?

For the grape juice, we get that the hydroxyl ion concentration is  1.4 ×10-10M.Hence, pOH will be = -log[1.4*10⁻¹⁰] which is approximately 9.6.Now the value of pH will be = 14-pOH = 14 - 9.6 = 4.4.For the orange juice, we know that the H+ or hydronium ion concentration is  1.8 × 10-4 M.Then, the value of the pH will be= -log[1.8*10⁻⁴]=3.7.Thus from the above result, it is clear that the range juice has lower pH, hence it will be more acidic. While the grape juice will be less acidic.  The pH can either go up or down depending on the change in hydronium concentration. If the hydronium concentration increases, the pH decreases, causing the solution to become more acidic. This happens when an acid is introduced. As H+ ions dissociate from the acid and bond with water, they form hydronium ions, thus increasing the hydronium concentration of the solution. If the hydronium concentration decreases, the pH increases, resulting in a solution that is less acidic and more basic. This is caused by the OH^- ions that dissociate from basesLearn more about Acid :https://brainly.com/question/15832107