Lactic Acid Hc 3 H 5 O 3 Is The Acid Which Forms When Milk Sours As Its Formula

3.   Lactic acid, HC3H5O3, is the acid, which forms when milk sours. As its formula indicates, this acid has an acid hydrogen ion. It requires 22.4 mL of NaOH at 0.156 M to neutralize the acid in a sample of 25.0 mL of lactic acid. Calculate the mass of lactic acid contained in the sample.

4.   Vinegar is a dilute solution of acetic acid. What is the concentration of acetic acid in the vinegar if 26.5 mL of NaOH at 0.250 M are required to neutralize 10.0 mL of vinegar?                                                       

5.   ASA tablets contain the analgesic acetylsalicylic acid, HC9H7O4, which has an acid hydrogen ion. During titration of a tablet of 0.250 g of ASA, 38.5 mL of KOH at 0.0223 M were required to reach end point. What was the percentage by mass of the acetylsalicylic acid in the tablet?

I got through the first couple ok and now I just can’t get it. Please show each step so I will understand as I move to the exam

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