Which of the following describes a potential problem with case studies? They generally involve too few participants to allow meaningful conclusions.
They generally involve too many participants to allow meaningful conclusions.
They are generally conducted by people who are untrained in scientific observation.
They are generally biased due to the patient's awareness of their illness.

explanation:

0.07 g/cm³

1.37 g/cm³

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.