Directions: The balanced equation shows the reaction of sodium hydroxide with hydrochloric acid. A total of 8.72 mimiters (mL) 0.42 NaOH reacts with 21.8 of HCl of unknown concentration . Use this information and the equation to answer any questions that follow. NaOH(aq)+HCl(aq) NaCl(aq)+H 2 O(l) what is the concentration of hydrochloric acid?

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.

How is the way a mixture is combined different from how a compound is combined?

Determine type of reaction & predict the product c3h12+o2 =