Question

Why does copper not replace hydrogen from acids?

Answer 1

Metals are arranged in descending order of their reactivities in the reactivity series, which is also known as the activity series. The reactivity series provides information that may be used to forecast whether a metal can displace another in a single displacement reaction. It can also be used to find out about a metal's reactivity with water and acids.

Complete answer:
Metals grow more reactive as they progress up the table, losing electrons (oxidising) more rapidly to create positive ions, corroding or tarnishing more readily, requiring more energy (and different procedures) to be isolated from their compounds, and becoming stronger reducing agents (electron donors).
The reactivity series is occasionally cited in the precise reverse order of standard electrode potentials, when it is also known as the "electrochemical series":
Li > Cs > Rb > K > Ba > Sr > Ca > Na > La > Y > Mg > Ce > Sc > Be > Al > Ti > Mn > V > Cr > Zn > Ga > Fe > Cd > In > Tl > Co > Ni > Sn > Pb > (H) > Sb > Bi > Cu > Po > Ru > Rh > Ag > Hg > Pd > Ir > Pt > Au
Metals have a proclivity for losing electrons and forming cations. Metal oxides are formed when most of them react with ambient oxygen. Various metals, on the other hand, have different reactivities towards oxygen (unreactive metals such as gold and platinum do not readily form oxides when exposed to air).
Because they are quickly oxidised, the metals near the top of the reactivity range are potent reducing agents. These metals discolour and corrode quickly.
As you progress through the series, the metals' power to reduce becomes less. While advancing down the reactivity series of metals, the electropositive of the elements likewise decreases.
When dilute HCl or dilute ${{H}_{2}}S{{O}_{4}}$ is used to react with metals above hydrogen in the activity series, ${{H}_{2}}$ gas is produced. Metals that are higher in the reactivity series can displace metals that are lower in the reactivity series from their salt solutions. The separation of higher-ranking metals from ores and other compounds necessitates more energy.
Cu has an ${{E}^{o}}$ value of positive. Because copper is less reactive than hydrogen, it will not be able to replace hydrogen in acids.

Note:
The use of the word "response rates" is limited, resulting in a more uniform viewpoint. The rate at which a chemical material tends to undergo a chemical reaction over time is referred to as reactivity. The physical characteristics of the sample control reactivity in pure chemicals. Grinding a sample to a larger specific surface area, for example, improves its reactivity. The presence of impurities in impure substances affects their reactivity as well. The crystalline shape of a chemical can also impact its reactivity. In all situations, however, reactivity is largely related to the compound's subatomic characteristics.