What tool is most suitable for spreading and shaping mortar?

The most suitable tool for spreading and shaping mortar is a trowel. A trowel is specifically designed for working with materials such as mortar, allowing for precise application, shaping, and smoothing of the substance. Trowels have a flat, pointed blade that enables the user to effectively spread mortar over surfaces and create smooth finishes, which is essential for masonry work.

In comparison, while a shovel is effective for digging and moving bulk materials, it lacks the finesse necessary for shaping mortar. A spatula, typically used for mixing or flipping, is not strong enough for heavy-duty tasks like applying mortar. A pickaxe is designed primarily for breaking up hard surfaces or digging in rocky soil, making it ill-suited for tasks involving the delicate application and manipulation of mortar.

Thus, the trowel's design and function make it the most appropriate tool for this specific job.