Mixed baking soda and Calamansi, a Philippine lime fruit is safe for the skin?

Is mixed baking soda (sodium bicarbonate) and calamnsi (citrofortunella microcarpa) safe for the skin? I am planning to apply it to my hands, feet, legs and armpit because I believe this is good for whitening skin as I have a lot of dark spots due to mosquito bites. Mixed baking soda and Calamansi, a philippine lime fruit is safe for the skin for whitening? Will it damage my body? They say it's not safe due to its Ph level?

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