Preheat oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan.
In a medium bowl, whisk together flour, granulated sugar, baking powder, baking soda, and salt.
In a large bowl, cream together the softened butter and powdered sugar until light and fluffy. Beat in eggs one at a time, then stir in lemon juice and zest.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
Pour batter into the prepared loaf pan and bake for 50-60 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.
Notes
For an extra lemony flavor, drizzle a lemon glaze over the cooled cake.