Olaf the snowman has a mass of 38 kg, and a body temperature of -4.2 degrees Celsius. He took a sip of hot coffee with a volume of 15 mL and a temperature of 80.0 degrees Celsius. The coffee turned into ice and eventually become a part of Olaf. Determine the final temperature of Olaf.

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.