I don’t see what you need help with but thanks:)
<span>1 drop is approximately 0.05mL. Since 0.500L of 0.550M NH4Cl contains 0.275mol of substance (calculated by using c=n/V formula), equal amount of substance of NH3 is needed to neutralize this solution (since pH of 7 is neutral solution). Thus, we need 0.0275L of NH3, i.e. around 550 drops.</span>
when using a jack it lifts up the car for you, giving you the ability to remove and replace a tire without the weight of the car on the tire.
75% i think it is consumers
25% i think it is producer