Church & Dwight Co. Inc, Princeton, NJ, the maker of Arm & Hammer baking soda, said it will split its stock on a three-for-two basis and increase its quarterly dividend.The company will pay a quarterly dividend of 6 cents per share on the split stock, which represents an annualized increase of 12.%. Church & Dwight said shares resulting from the stock split and the increased dividend will be distributed on Sept. 1 to stockholders of record August 16....