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If one only considers the soil texture, the main driving force for a faster increase in pH in sandy soils is the faster leaching process. Because of the coarse texture of sand, water can easily move through the sandy layers and leach out chemical elements.

Naturally, all soils tend to acidify through time if no actions are taken. This proces happens much faster in sandy soils. pH increasing elements such as carbonate (from the weathering of calcium carbonate, very abundant in soils) leach out very quickly.

Also the organic decomposition rate is much higher when water is moving faster trhough the soil. This decomposition acidifies the soil as well.

Looking at the texture only, a sandy soil is more acidic, just because it is in a further state of weathering, compared to other textures such as clay.

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