A 1922 silver dollar can be worth between $28 and $63, depending on the condition of the coin and whether or not the coin has been circulated.
A coin is considered circulated if it has been used as tender. A coin is considered uncirculated if it has never been used and is in mint condition. There are coins that are very valuable even when they are in poor condition; you will want to avoid cleaning those collectible coins. Cleaned coins can easily be spotted by reputable sellers and are worth significantly less on the market. Coin dealers cannot easily replenish their stocks by having new coins minted; they have to purchase more coins from fellow dealers and collectors.