An erlenmeyer flask contains 25.00 ml of 0.500 m hcl before a titration is begun. how many moles of hydrogen ions are present in the flask at this time?
0.0125
12.5
20.0
50.0

Idon’t know how to solve this question

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.