A student mixes 20% acid solution with a 40% acid solution to produce 20 liters of a 28 acid solution how many liters of a 20% acid solution. How many liters of the 20% acid solution was needed

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.