Anna Is Conducting an Experiment Using a PH Indicator That

question 1

Multiple Choice

Anna is conducting an experiment using a pH indicator that is red at low pH, green at neutral pH, and purple at high pH. She starts with a green solution. When she adds compound X to her solution it turns purple. Then she adds compound Z to the solution and it turns green. She adds more Z and the solution remains green. These observations suggest X is and Z is .

• A) a base; a strong acid
• B) a base; a buffer
• C) a buffer; a base
• D) an acid; a base
• E) an acid; a buffer

---

Definitions:

Emancipation Proclamation

An executive order issued by President Abraham Lincoln in 1863, declaring the freedom of all enslaved people in Confederate states that were in rebellion against the Union.

1863

A significant year in U.S. history marked by the Emancipation Proclamation, which declared the freedom of slaves in Confederate territories.

No Man's Land

A term used to describe the unoccupied land or territory between opposing trenches on a battlefield, especially during World War I, often dangerous and heavily mined.

Front Lines

The most forward position of an army or fleet during a conflict where direct fighting occurs.