A buffer is made by adding 0.68g of sodium formate NaHCOO (molar mass=68g/ mol) to 1 L of 0.015 M formic acid , HCOOH (Ka=n1.8*10^-4). The pH of the buffer is 3.57. What will pH be after 10 mL of 0.50 M HCL(aq) is added?

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

One does not belong why? ice, gold ,wood ,diamond and table salt

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?