1. how to prepare an HNO3 solution (50ml) with a concentration of 15 mM from 70% HNO3 (density: 1.42g/ml) 2. what is the molar concentration of Pb2+ (15 ppb)

3. What is the pH of acetic acid (10 mM, ka = 1.8x10^-5)

4. How to prepare a 2L sodium phospate (50 mM, pH 7.4)

Calculate the mass percent of hydrogen in methyl acetate

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k